Founded in circa 1077 by William and Gundrada de Warenne, the massive Cluniac Priory of St. Pancras is reputed to have been larger than that at Chichester. Unfortunately, in 1538 it was largely destroyed by Thomas Cromwell during Henry VIII's infamous Dissolution of the Monasteries. Fragments of the marble 13th Great Gate and domestic buildings remain. In 1845, the tombs of William de Warrene and his wife, Gundrada were found during the construction of the railway between Lewes and Brighton. The two now lie in the nearby Church of St. John the Baptist. Tours are available in summer.