Peter Heylyn or Heylin (29 November 1599 – 8 May 1662) was an English ecclesiastic and author of many polemical, historical, political and theological tracts. He incorporated his political concepts into his geographical books Microcosmus in 1621 and Cosmographie (1657). Life Heylyn was born in Burford, Oxfordshire, the son of Henry Heylyn and Elizabeth Clampard. He entered Merchant Taylors' School in March 1612. At 14 he was sent to Hart Hall, Oxford, and matriculated from Magdalen College, Oxford, on 19 January 1616, aged 16. He was awarded BA on 17 October 1617 and was elected a Fellow in 1618. He lectured on historical geography at Magdalen. Heylyn was awarded MA on 1 July 1620. In 1620 he presented his lecture to Prince Charles, at Theobalds. He was incorporated at Cambridge University in 1621. In 1621 his lectures were published as Microcosmos: a Little Description of the Great World. This would prove to be his most popular work and by 1639, eight editions had been produced. At college, where he was dubbed 'the perpetual dictator', Heylyn had been an outspoken controversialist. He subsequently became an outspoken preacher and one of Charles I's clerical followers. He was awarded a BD on 13 June 1629. As a member of the Arminian party he played a part in struggles between the Arminians and their opponents that disturbed England in the 1630s. In 1630 he lectured against the Feoffees for Impropriations. He became licensed Canon of Westminster in 1631 and Rector of Hemingford, Huntingdonshire, in the same year. He became Rector of Houghton-le-Spring, County Durham, in 1632 and rector of Alresford, Hampshire, in 1633. Also in 1633 he was licensed to preach and was awarded D.D. on 13 April 1633. He became a chaplain to Charles I. In 1639 he became Rector at South Warnborough, Hampshire. He suffered for his loyalty to the king when, under the Commonwealth, he was deprived of his preferments. He subsequently settled at Lacies Court in Abingdon, from 1653 until 1660. Lacies Court is now the heads residence at Abingdon School. Heylyn supported Anthony Huish (Master of the School) in maintaining the services at St Nicholas Church where Huish was rector. This was opposed by the Puritan dominated town council. A house facing Bath Street from the Abingdon School grounds is named 'Heylyns' in commemoration. At the Restoration, he left Abingdon and was made sub-Dean of Westminster, but poor health