Just behind the house, you will find the parish church of St. Mary's, Lydiard Tregoze. Visitors to Lydiard House can sign out the key to the church at the ticket desk, during house opening hours, Tuesday to Sunday 11am to 5pm when the church is not in use for services.
St Mary's is one of England's finest small churches and dates back to the 12th century. It is packed with fascinating monuments to the St. John family including St John Polyptych, erected by John St John in 1615 and the Golden Cavalier, a full-size effigy of Edward St John, who died of injuries sustained in the Battle of Newbury, English Civil War.
Historian and writer, Simon Jenkins,
wrote in praise of St Mary’s in 2004: “Were the South Chapel to be removed lock, stock and barrel to the Victoria & Albert Museum in London, it would cause a sensation.”