John "Of Gaunt" of England Duke of Lancaster
John "Of Gaunt" of was born in March 1340 in Abbaye de St. Bavon,Ghent,Flandre-Orientale,Belgium.  He died at the age of 58 on February 3rd, 1399 in Leichester Castle,Leichestershire,England.  He was buried in St. Paul's,London,Middlesex,England.

 Constanza de Castilla Princesa
Constanza de was born in 1354 in Castrojeriz,Burgos,Spain.  She died at the age of 40 on March 24th, 1394 in Leicester,Leicestershire,England.

 Catherine of Lancaster
Catherine of was born before March 31st, 1373 in of Leicester,Leicestershire,England.  She died on June 2nd, 1418 in Valladolid,,Spain.

 John Plantagenet
John was born about 1374 in of Hertford,Hertfordshire,England.  He died in 1375.