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Captain John Wilgress
He served in the First Dutch War (1652-54) and held five commands from 1660-71.
His first and last appearance in the diary is on 1 April 1660.
Sir William Coventry (whom we haven't met as of 1 April 1660) didn't trust him. An official in the Navy, Coventry was Pepys's "most valued mentor and colleague"
-- Latham and Matthews edition of the diary, Vols. 10 (Companion) and 11 (Index)