DORISLAUS, ISAAC (1595-1649), Anglo-Dutch lawyer and diplomatist, was born at Alkmaar, Holland, the son of a min ister of the Dutch Reformed Church. He was educated at Leyden, removed to England about 1627, and was appointed to a lecture ship in history at Cambridge, where his attempt to justify the Dutch revolt against Spain led to his early resignation. In 1629 he was admitted a commoner of the College of Advocates. In 1632 he made his peace at court, and on two occasions acted as judge advocate, in the bishops' war of 164o and in 1642 in the army com manded by Essex. In 1648 he became one of the judges of the admiralty court, and was sent on a diplomatic errand to the States General of Holland. He assisted in preparing the charge of high treason against Charles I., and, while negotiating an alliance be tween the Commonwealth and the Dutch republic, was murdered at The Hague by royalist refugees on May so,