(bc.1574; d London, Aug. 1617). English gentleman. For many years he was identified with the copying of a number of important music manuscripts, including the famous Fitzwilliam Virginal Book. This theory has recently been challenged, and it is now unclear what connection exists between the manuscripts and the various members of the Tregian family whose names (or, more often, initials) appear in the virginal book.
From The Oxford Companion to Music in Oxford Reference.