 Until the Dissolution of the Monasteries Mundon formed part of the estates of St John's Abbey, Colchester; it passed to Thomas Cromwell before being returned to the Duchy of Lancaster, which held the right of presentation to the vicarage until the 20th century.The 14th-century timber-framed Church of St. Mary, built within the remains of the moat of Mundon Hall, and likely on Saxon and Norman foundations, has been disused since the 1970s, but is currently in the care of Friends of Friendless Churches, supported by English Heritage.Following a long period of remedial work, the church re-opened to visitors in August 2009.