The garden was designed by
Harold Peto, (1854–1933), for its owner
John Annan Bryce, (1841–1923), a
Belfast native, who purchased the island from the
War Office in 1910. Bryce's son Roland bequeathed the island to the Irish nation in 1953. It was taken over and is still maintained by the Office of Public Works. Renowned for its gardens and architecture (a mansion was designed by Peto but was never built), the island has played host to writers including
George Bernard Shaw and
George William Russell. There is a restored
Martello tower on the island dating from the time of the
Napoleonic Wars. The tower, like others in Cork, but unlike other Irish Martello towers, has a straight cylindrical shape that does not splay out at its base. Mains electricity was brought to the island in the early 1950s via overhead cable. ==Gardens==