Because of its royal patronage, the abbey was one of the pilgrimage centres of medieval England, and one of its richest and most important religious houses, with possessions as far away as Herefordshire and Scotland. The abbey also held over 230 relics including the hand of St James. A shrivelled human hand was found in the ruins during demolition work in 1786 and is now in St Peter's RC Church, Marlow. The song Sumer is icumen in, which was first written down in the abbey about 1240, is the earliest known six part harmony from Britain. The original document is held in the British Library.