Henry de Percy 3rd Lord Percy & Lady Mary Plantagenet 
Henry and Mary were married about September 1334 in Tutbury Castle, Staffordshire, England. They had a son named Henry.
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Personal Details
Lady Mary Plantagenet
Mary was born about 1320 in Tutbury Castle, Staffordshire, England. She died on September 1st, 1362. She was buried in Alnwick, Northumberland, England.
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Children
Henry Percy, 1st Earl of Northumberland
Henry was born on November 10th, 1341. He died at the age of 66 on February 20th, 1408.