John 3rd Baron de Mowbray , of Thirsk, Sir
John 3rd Baron de was born on November 29th, 1310 in Hovingham, Malton, North Ride Yorkshire, England.  He died at the age of 50 on October 4th, 1361 in York, Yorkshire, England.

 Joan Plantagenet
Joan was born about 1320 in Grosmont Castle, Monmouthshire, Wales.  She died on July 7th, 1349 in Byland Abbey, Yorkshire, England.

 John 4th Baron de Mowbray , of Thirsk, Sir
John 4th Baron de was born on June 25th, 1340 in Epworth, Isle of Axholme, Lincolnshire, England.  He died at the age of 28 in October 1368 in Killed by Saracens near Constantinople.

 Eleanor (Alianore) de Mowbray
Eleanor (Alianore) de was born about 1345 in Epworth, Isle of Axholme, Lincolnshire, England.  She died before June 18th, 1387.