Willys was born about 1612 (baptised 6 September that year), son and heir of barrister Richard Willys, of Fen Ditton and Horningsey, Cambridgeshire, and Jane, daughter and heiress of William Henmarsh, of Balls, in Ware, Hertfordshire. His younger brother, Sir
Richard, was an officer in the Royalist Army during the
Civil War but was shunned by the court after the
Restoration for working as a double agent for
Oliver Cromwell during the
Interregnum. Willys inherited his father's estates on 16 October 1628. == Career ==