| English Royalty |
| House of Plantagenet |

Armorial of Plantagenet |
| Edward III |
| Edward, Prince of Wales |
| Lionel, Duke of Clarence |
| John, Duke of Lancaster |
| Edmund, Duke of York |
| Thomas, Duke of Gloucester |
| Joan of England |
| Isabella, Countess of Bedford |
| Grandchildren |
| Richard II |
| Philippa, Countess of Ulster |
| Philippa, Queen of Portugal |
| Elizabeth, Baroness Fanhope and Milbroke |
| Henry IV |
| Katherine, Queen of Castile |
| Edward, Duke of York |
| Richard, Earl of Cambridge |
| Constance of York |
| Anne, Countess of Eu |
Katherine of Lancaster (also known as Katherine Plantagenet and as Queen Catalina of Castile and Leon) (1372/1373 – 2 June 1418) was the daughter of John of Gaunt, 1st Duke of Lancaster, and his second wife, Constance of Castile. She was born in Hertford Castle, her father's chief country home.
She married Enrique III of Castile in 1393 at Burgos. As her mother was daughter of Pedro of Castile, and had been a claimant to the Castilian throne herself, the marriage helped to restore a semblance of legitimacy to the Trastamara line.
The couple had three children:
Enrique III died in 1406 and according to his will his widow Catherine and his brother Ferdinand I of Aragon served as co-regents during the minority of Juan II. But tensions between the regents led to a division of rule. Catherine received the north of the Empire and was alone regent after Ferdinand's death in 1416.
Queen Catherine died at Valladolid of a stroke, possibly precipitated by her great obesity, leaving her thirteen year-old son at the mercy of self-interested courtiers. She is the namesake of her great granddaughter Katherine of Aragon, first of the six wives of Henry VIII of England.
Ancestors
Katherine's ancestors in three generations
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