The Tower of Refuge is a stone-built castellated structure which was erected on St Mary's Isle in Douglas Bay, Isle of Man, in order to afford shelter to mariners wrecked on the rock. The tower was constructed through the endeavours of Sir William Hillary, who had been instrumental in several rescues of sailors stranded on the rock, and which culminated in the heroic rescue of the crew of the Saint George Steam Packet Company steamer RMS St George, when it foundered on the rock in the early hours of November 20, 1830. Sir William personally contributed a high proportion of the costs and secured a substantial number of public contributions for funding the structure.