Dunguaire Castle in County Galway is a fortified tower house dating back to 1520 that is built on the edge of Galway Bay. The castle was built by the Hynes clan and named after their ancestor Guaire Aidne mac Colmáin, a legendary king of Connacht. After passing through different families over the centuries, the castle was eventually purchased by Oliver St. John Gogarty, a doctor, write and senator who often invited famous Irish authors like W.B. Yeats to stay.