On 12 Mar 1237 (age 27) and Margaret Guelders Countess Jülich were married. They were third cousins. She a great x 4 granddaughter of King William "Conqueror" I of England 1028-1087. She by marriage Countess Jülich. He would, thirteen years later, marry her sister Richardis Guelders Countess Jülich (age 22); an example of Married to Two Siblings. She the daughter of Gerard III Count Guelders 1185-1229 and Margaret Reginar Countess Guelders. He the son of William Jülich III Count Jülich -1219 and Matilda Luxemburg Countess Jülich.

Before Jan 1250 (age 40) and Richardis Guelders Countess Jülich (age 35) were married. They were third cousins. She a great x 4 granddaughter of King William "Conqueror" I of England 1028-1087. She by marriage Countess Jülich. He had previously married her sister Margaret Guelders Countess Jülich; an example of Married to Two Siblings. She the daughter of Gerard III Count Guelders 1185-1229 and Margaret Reginar Countess Guelders. He the son of William Jülich III Count Jülich -1219 and Matilda Luxemburg Countess Jülich.

Before 1361 William Ufford 2nd Earl Suffolk (age 22) and Joan Montagu Countess Suffolk (age 11) were married. She a great granddaughter of King Edward "Longshanks" I of England 1239-1307. It appears he may later have married her sister . It appears he may later have married her sister Elizabeth Montagu Countess Suffolk (age 16) although there is some uncertainty; an example of Married to Two Siblings. And it true, an example of a brother marrying two sisters, and one of those sisters, Elizabeth Montagu Countess Suffolk (age 16), marrying two brothers? He the son of Robert Ufford 1st Earl Suffolk (age 62) and Margaret Norwich Countess Suffolk (age 74).

Before 1361 Walter Ufford (age 17) and Elizabeth Montagu Countess Suffolk (age 16) were married. She a great granddaughter of King Edward "Longshanks" I of England 1239-1307. She would later marry his brother . She would later marry his brother William Ufford 2nd Earl Suffolk (age 22); an example of Married to Two Siblings. He the son of Robert Ufford 1st Earl Suffolk (age 62) and Margaret Norwich Countess Suffolk (age 74).

Around 1390 (age 22) and Anne of Gloucester Plantagenet Countess Eu and Stafford (age 7) were married. They were third cousin once removed. He a great x 3 grandson of King Edward "Longshanks" I of England 1239-1307. She a granddaughter of King Edward III of England 1312-1377. She by marriage Countess Stafford. She would, eight years later marry his younger brother Edmund Stafford 5th Earl Stafford (age 11); an example of a Married to Two Siblings. She the daughter of Thomas of Woodstock 1st Duke of Gloucester (age 34) and Eleanor Bohun Duchess Gloucester (age 24). He the son of Hugh Stafford 2nd Earl Stafford 1336-1386 and Philippa Beauchamp Countess Stafford (age 56).

On 28 Jun 1398 Edmund Stafford 5th Earl Stafford (age 20) and Anne of Gloucester Plantagenet Countess Eu and Stafford (age 15) were married. They were third cousin once removed. He a great x 3 grandson of King Edward "Longshanks" I of England 1239-1307. She a granddaughter of King Edward III of England 1312-1377. She by marriage Countess Stafford. She had, around eight years previously, married his brother who had died in 1392; an example of Married to Two Siblings. She the daughter of Thomas of Woodstock 1st Duke of Gloucester and Eleanor Bohun Duchess Gloucester (age 32). He the son of Hugh Stafford 2nd Earl Stafford 1336-1386 and Philippa Beauchamp Countess Stafford (age 64).

After 1416 William Ufford 2nd Earl Suffolk and Elizabeth Montagu Countess Suffolk were married. She a great granddaughter of King Edward "Longshanks" I of England 1239-1307. She by marriage Countess Suffolk. She was previously married to his brother Walter Ufford (age 72); an example of Married to Two Siblings. There is some uncertainty about this marriage since she was the sister of his first wife Joan Montagu Countess Suffolk. He the son of Robert Ufford 1st Earl Suffolk and Margaret Norwich Countess Suffolk.

Before 22 Feb 1452 (age 27) and Margaret "Fair Lady of Galloway" Douglas Countess (age 17) were married.They were first cousin once removed. She would later marry his younger brother . She would later marry his younger brother James Douglas 9th Earl Douglas 3rd Earl Avondale (age 26); an example of Married to Two Siblings. She the daughter of Archibald Douglas 2nd Duke Touraine and Euphemia Graham Lady Hamilton (age 44). He the son of James "Gross" Douglas 7th Earl Douglas 1st Earl Avondale and Beatrix Sinclair Countess Douglas and Avondale (age 54).

Before 1455 James Douglas 9th Earl Douglas 3rd Earl Avondale (age 29) and Margaret "Fair Lady of Galloway" Douglas Countess (age 19) were married. They were first cousin once removed.. She by marriage Countess Douglas, Countess Avondale. She had previously married his brother ; an example of Married to Two Siblings. She the daughter of Archibald Douglas 2nd Duke Touraine and Euphemia Graham Lady Hamilton (age 46). He the son of James "Gross" Douglas 7th Earl Douglas 1st Earl Avondale and Beatrix Sinclair Countess Douglas and Avondale (age 56).

In 1497 Manuel "Fortunate" I King Portugal (age 27) and Isabella Trastámara Queen Consort Portugal (age 27) were married. They were second cousins. He a great x 3 grandson of King Edward III of England 1312-1377. She a great x 3 granddaughter of King Edward III of England 1312-1377. She by marriage Queen Consort Portugal. He would, three years later, marry her younger sister Maria Trastámara Queen Consort Portugal (age 15); an example of Married to Two Siblings. She the daughter of Ferdinand II King Aragon (age 44) and Isabella Queen Castile (age 45).

In 1500 Manuel "Fortunate" I King Portugal (age 30) and Maria Trastámara Queen Consort Portugal (age 18) were married. They were second cousins. He a great x 3 grandson of King Edward III of England 1312-1377. She a great x 3 granddaughter of King Edward III of England 1312-1377. She by marriage Queen Consort Portugal. She the younger sister of his first wife Isabella Trastámara Queen Consort Portugal; an example of Married to Two Siblings. She the daughter of Ferdinand II King Aragon (age 47) and Isabella Queen Castile (age 48).

On 05 May 1543 Sigismund II King Poland (age 22) and Elisabeth Habsburg Spain Queen Consort Poland (age 16) were married. She a great x 5 granddaughter of King Edward III of England 1312-1377. He would, ten years later, marry her younger sister . He would, ten years later, marry her younger sister Catherine of Austria Queen Consort Poland (age 9); an example of Married to Two Siblings. She the daughter of Ferdinand I Holy Roman Emperor (age 40) and Anne Jagiellon Holy Roman Empress (age 39).

After Jun 1549 Henry Neville 5th Earl of Westmoreland (age 24) and Jane Cholmley Countess of Westmoreland (age 31) were married. She by marriage Countess Westmoreland. He would later marry her older sister Margaret Cholmley Countess of Westmoreland (age 41); an example of Married to Two Siblings. He the son of Ralph Neville 4th Earl of Westmoreland and Katherine Stafford Countess of Westmoreland (age 50).

On 30 Jul 1553 Sigismund II King Poland (age 32) and Catherine of Austria Queen Consort Poland (age 19) were married. She a great x 5 granddaughter of King Edward III of England 1312-1377. She by marriage Queen Consort Poland. He had, ten years before, married her older sister Elisabeth Habsburg Spain Queen Consort Poland; an example of Married to Two Siblings. She the daughter of Ferdinand I Holy Roman Emperor (age 50) and Anne Jagiellon Holy Roman Empress.

In or after 1558 Henry Neville 5th Earl of Westmoreland (age 33) and Margaret Cholmley Countess of Westmoreland (age 50) were married. She by marriage Countess Westmoreland. She the older sister of his first wife Jane Cholmley Countess of Westmoreland (deceased); an example of Married to Two Siblings. He the son of Ralph Neville 4th Earl of Westmoreland and Katherine Stafford Countess of Westmoreland.

On 02 Aug 1666 Alfonso VI King Portugal (age 22) and Marie Françoise Élisabeth of Savoy Queen Consort of Portugal (age 20) were married. She had arrived in Portugal on the same day. The marriage was not consummated. She subsequently married her brother-in-law Peter II King Portugal (age 17) when he took control of the Portuguese throne; an example of Married to Two Siblings. She by marriage Queen Consort Portugal. He the son of John IV King Portugal and Luisa de Guzman Queen Consort Portugal.

On 02 Apr 1668 Peter II King Portugal (age 18) and Marie Françoise Élisabeth of Savoy Queen Consort of Portugal (age 21) were married. She had, two years before, married his older brother Alfonso VI King Portugal (age 24) who he, Peter, had deposed; an example of Married to Two Siblings. He the son of John IV King Portugal and Luisa de Guzman Queen Consort Portugal.

Before 1669 Edward Gage 1st Baronet (age 52) and Bridget Feilding Lady Gage were married. She by marriage Lady Gage of Hengrave in Suffolk. He would, eleven years later, marry her sister Frances Feilding Lady Gage; an example of Married to Two Siblings. She the daughter of George Feilding 1st Earl Desmond 1614-1665 and Bridget Stanhope Countess Desmond (age 53).

In Sep 1669 John Washington (age 37) and Anne Gerrard (age 39) were married. He would, seven years later, marry her sister Frances Gerard (age 39); an example of Married to Two Siblings.

On 20 Mar 1676 John Washington (age 44) and Frances Gerard (age 46) were married. She the sister of his first wife Anne Gerrard; an example of Married to Two Siblings.

Before 1680 Edward Gage 1st Baronet (age 63) and Frances Feilding Lady Gage were married. She by marriage Lady Gage of Hengrave in Suffolk. She the sister of his previous wife Bridget Feilding Lady Gage; an example of Married to Two Siblings. She the daughter of George Feilding 1st Earl Desmond 1614-1665 and Bridget Stanhope Countess Desmond (age 64).

Around 1700 Edward Phelips (age 22) and Anne Phelips (age 12) were married.They were first cousins. He would, twenty years later, marry her sister . He would, twenty years later, marry her sister Elizabeth Phelips; an example of Married to Two Siblings.

Around 1720 Edward Phelips (age 42) and Elizabeth Phelips were married.They were first cousins. She the sister of his first wife . She the sister of his first wife Anne Phelips; an example of Married to Two Siblings. Both of whom were his first cousin.

In 1764 Peyton Skipwith 7th Baronet (age 23) and Anne Miller Lady Skipwith were married. He would later marry her sister Jean Miller Lady Skipwith; an example of Married to Two Siblings.

On 18 Sep 1768 Grand Duke Charles II of Mecklenburg Strelitz (age 26) and Princess Friederike of Hesse-Darmstadt (age 16) were married. He would, six years later, marry her younger sister Princess Charlotte of Hesse-Darmstadt (age 12); an example of Married to Two Siblings.

28 Sep 1784 Grand Duke Charles II of Mecklenburg Strelitz (age 42) and Princess Charlotte of Hesse-Darmstadt (age 28) were married. She the sister of his first wife Princess Friederike of Hesse-Darmstadt; an example of Married to Two Siblings.

On 25 Sep 1788 Peyton Skipwith 7th Baronet (age 47) and Jean Miller Lady Skipwith were married. She, Anne, the sister of his first wife Anne Miller Lady Skipwith; an example of Married to Two Siblings. She by marriage Lady Skipwith of Prestwould in Leicestershire.

In 1804 John Duntze 2nd Baronet (age 42) and Dorothea Carew were married. He would, four years later, marry her sister Elizabeth Carew; an example of Married to Two Siblings.

In 1808 John Duntze 2nd Baronet (age 46) and Elizabeth Carew were married. She the sister of his first wife Dorothea Carew; an example of Married to Two Siblings.

On 07 Aug 1809 Henry St John-Mildmay 4th Baronet (age 22) and Charlotte Bouverie were married. He would later marry her sister Harriett Bouverie Countess Camden (age 18); an example of Married to Two Siblings.

On 25 Jul 1814 Henry Somerset 7th Duke Beaufort (age 22) and Georgiana Frederica Fitzroy (age 21) were married at Upper Brook Street.They were fourth cousins. She a great x 4 granddaughter of King Charles II of England Scotland and Ireland 1630-1685. Following her death in 1821 he would marry her younger half-sister at Upper Brook Street. Following her death in 1821 he would marry her younger half-sister Emily Frances Smith Duchess Beaufort (age 14). An example of a man marrying two sisters, albeit in this case half-sisters. He the son of Henry Charles Somerset 6th Duke Beaufort (age 47) and Charlotte Sophia Leveson-Gower Duchess Beaufort (age 43).

In 1815 Henry St John-Mildmay 4th Baronet (age 27) and Harriett Bouverie Countess Camden (age 24) were married. She the sister of his first wife Charlotte Bouverie; an example of Married to Two Siblings.

On 29 Jun 1822 Henry Somerset 7th Duke Beaufort (age 30) and Emily Frances Smith Duchess Beaufort (age 22) were married. She being the younger half-sister of his first wife Georgiana Frederica Fitzroy both of whom's mother was Anne Wellesley (age 54) sister of Arthur Wellesley 1st Duke Wellington (age 53). An example of a man marrying two sisters, albeit in this case half-sisters. He the son of Henry Charles Somerset 6th Duke Beaufort (age 55) and Charlotte Sophia Leveson-Gower Duchess Beaufort (age 51).

On 25 May 1839 John James Waldegrave and Frances Braham Countess Waldegrave (age 18) were married. He a great x 4 grandson of King James II of England Scotland and Ireland 1633-1701. She would, a year later, marry his legitimate half-brother . She would, a year later, marry his legitimate half-brother George Edward Waldegrave 7th Earl Waldegrave (age 23); an example of Married to Two Siblings. He the son of John James Waldegrave 6th Earl Waldegrave 1785-1835.

On 28 Dec 1865 William Holman Hunt (age 38) and Fanny Waugh (age 32) were married at Christ Church Paddington. William Michael Rossetti (age 36) and Emil Waugh were witnesses. He would, ten years later, marry her younger sister Marion Edith Waugh (age 18); an example of Married to Two Siblings.

On 30 Jun 1879 John Collier (age 29) and Marian "Mady" Huxley (age 20) were married. They had one child. He would marry her sister Emma aka Ethel Huxley (age 13) ten years later; Married to Two Siblings.

In 1889 John Collier (age 38) and Emma aka Ethel Huxley (age 23) were married in Norway; marriage to a former wife's sister being illegal in England at the time. She the sister of his late wife Marian "Mady" Huxley; Married to Two Siblings.

On 16 Jan 1892 James Reginald Graham (age 28) and Florence Rose Wood Lady Graham were married. She would, thirty-five years later, marry his younger brother Richard James Graham 4th Baronet (age 33); an example of Married to Two Siblings.

On 26 Apr 1892 Henry FitzWalter Plumptre 20th Baron FitzWalter (age 31) and Maude Dora Gertrude Baird (age 26) were married. He would, eighteen years later, marry her older sister Emily Harriett Jemima Baird (age 30); an example of Married to Two Siblings.

In Jul 1913 Lionel Francis Crane (age 37) and Gertrude Sandys (age 41) were married. an example of Married to Two Siblings - following her death in 1920 he married her sister Winifred Gertrude Sandys (age 42).

In 1921 Lionel Francis Crane (age 44) and Winifred Gertrude Sandys (age 49) were married. an example of Married to Two Siblings - he had previously been married to her sister Gertrude Sandys.

On 01 Jan 1927 Richard James Graham 4th Baronet (age 68) and Florence Rose Wood Lady Graham were married. She the widow of his younger brother James Reginald Graham; an example of Married to Two Siblings.