Catherine married John "of Gaunt" Plantagenet, 1st. Duke of Lancaster on 13 Jan 1396 in Lincoln Cathedral, Lincolnshire, England. John (son of King Edward III Plantagenet, of England and Phillippa of Hainault) was born in Mar 1340 in St. Bavon's Abbey, Ghent, Belgium; died on 3 Feb 1399 in Leicester Castle, Leicester, Leicestershire, England; was buried on 15 Mar 1399 in St. Paul's Cathedral, London, England. [Group Sheet]

1. John Beaufort, 1st. Earl of Somerset was born about 1373; died on 16 Mar 1410.
2. Joan Beaufort was born about 1379 in Chateau de Beaufort, Haute-Loire, France; died on 13 Nov 1440 in Howden, Yorkshire, England; was buried in Lincoln Cathedral, Lincolnshire, England.