John (3rd Lord) De Mowbray
John (3rd Lord) was born on November 29th, 1310 in Hovingham, Yorkshire, England.¹   He died at the age of 50 on October 4th, 1361 in Bedford, Bedfordshire, , England.¹ 

 Lady Joan Plantagenet
Lady Joan was born in 1312.  She died at the age of 33 on July 7th, 1345.

 John (4th Lord Mowbray) Mowbray
John (4th Lord Mowbray) was born on June 24th, 1340.  He died at the age of 28 in 1368 in at Constantinople, Turkey.