John Micklethwaite was the son of Thomas Micklethwaite, rector ofCherry Burton,Yorkshire, and was baptised, 23 August 1612, in the church ofBishop Burton, three miles fromBeverley. He entered at theUniversity of Leyden as a medical student in 1637, and took the degree of M.D. at theUniversity of Padua in 1638. He proceeded M.D. by incorporation at Oxford 14 April 1648.[1]
On 26 May 1643, Micklethwaite was appointed assistant physician atSt. Bartholomew's Hospital to Dr John Clarke, whose eldest daughter he married, and he was elected physician 13 May 1653. TheLong Parliament, 12 Feb. 1644, had recommended him for promotion, "in the place ofDr. Harvey, who hath withdrawn himself from his charge and is retired to the party in arms against the Parliament." He was elected a fellow of theCollege of Physicians 11 November 1643, and delivered theGulstonian lectures in 1644. He was elected censor seven times, was treasurer from 1667 to 1675, and president from 1676 to 1681.[1]
When Charles II in 1681 was taken ill atWindsor, Micklethwaite was sent for byOrder in Council, and attained much repute by his treatment of the king, on whose recovery he was knighted. He was physician in ordinary to the king. He died of acutecystitis 29 July 1682, and was buried in the church ofSt. Botolph, Aldersgate, where his monument, with a long inscription, still remains. His death and achievements were celebrated in a broadside,An Elegy to commemorate and lament the Death of the most worthy Doctor of Physick, Sir John Micklethwaite. His portrait, representing him in a flowing wig, was given to the College of Physicians bySir Edmund King, and hung in the dining-room.[1]