Isaac Oliver and his son Peter Oliver succeeded Hilliard. Isaac (c. 1560–1617) was the pupil of Hilliard. Peter (1594–1647) was the pupil of Isaac. The two men were the earliest to give roundness and form to the faces they painted. They signed their best works in monogram, and painted not only very small miniatures, but larger ones measuring as much as 10 in × 9 in (250 mm × 230 mm). They copied for Charles I of England (1600-1649) on a small scale many of his famous pictures by the old masters.