John II de Grey & Avice de Marmion 
They had a son and a daughter, named Robert de Marmion and Maud.
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Personal Details
John II de Grey
John II was born on October 9th, 1300. He died at the age of 58 on September 1st, 1359 in Rotherfield, Oxfordshire, England.
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Children
Robert de Marmion de Grey
Robert de Marmion was born before 1359. He died before November 30th, 1367.
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