found this about catalina:
"1406-18 Regent Dowager Queen Catalina de Lancaster of Castilla (Spain)
Widow of Enrique III (1379-90-1406) she was joint regent with Fernando de Antequera for son, Juan II (1405-06-54). She was an active regent, involved in financial matters, using her influence in negotiation about matrimonies and peace-treaties in the most important European nations. She was daughter of John of Gaunt, Duke of Lancaster and Aquitaine (1340-99) and his second wife, Constance, titular Queen of Castile (1354-94) whose father, Pedro I of Castile and Leon (1350-69), was succeeded by a brother. Catalina was considered heiress of Castilla and married her half-cousin, King Enrique, and became the mother of 1 son and 2 daughters, and lived (1374-1418)."
