Education
He graduated Bachelor of Arts in 1634 and Master of Arts
He graduated Bachelor of Arts in 1634 and Master of Arts
He was a native of Lincolnshire. He entered Magdalene College, Cambridge, on 2 June 1631, but two months later migrated to Peterhouse, Cambridge, where he was admitted a sizar on 9 August, and where he was a fellow student with Richard Crashaw and Joseph Beaumont, afterwards master of the college. and ordained in 1642. in 1638. A committed Royalist, after many years as a military chaplain he became the incumbent at Knaresborough in 1660.
Subsequently, for at least five years (1650-1655), during the interregnum, he publicly preached at Saint Peter"s, Paul"s Wharf, London, where, notwithstanding the prohibition of the law, he used the Book of Common Prayer, and administered the holy communion monthly.
This brought a great concourse of nobility and gentry to the church. After he had been silenced Mossom maintained himself by keeping a school.
After that he was Precentor at Christ Church, Dublin until his elevation to the Episcopate.