In the IPM of his father, Thomas Copley, dated 26th May 1586, William is the "son and heir of Thomas Copley aet 19". This give William a birth year of about 1565/6.
https://discovery.nationalarchives.gov.uk/details/r/c1466180-d6c7-4266-8114-59e7e4a41282; Bond given by Lady Katherine Copley and her son, William Copley of Gatton, to Sir Francis Carew guaranteeing his title to lands in Beddington and Bandon, previously the property of Sir Thomas Copley, deceased. Dated 6 February 1586/7
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