It is reported, I know not on what authority, that, on the 1st of November, 1755, the day of the great earthquake at Lisbon, a castle, on the western boundary of the parish of Kinvarra, which had formerly belonged to the O’Heynes,’ was destroyed, and a portion of it swallowed up.
Lisbon, Portugal, during the great earthquake of 1 November 1755. This copper engraving, made that year, shows the city in ruins and in flames. Tsunamis rush upon the shore, destroying the wharfs. The engraving is also noteworthy in showing highly disturbed water in the harbor, which sank many ships. Passengers in the left foreground show signs of panic. Original in: Museu da Cidade, Lisbon. Reproduced in: The Lisbon Earthquake. British Historical Society of Portugal, 1990 Wikipedia.org
(Thomas L. Cooke’s rambles 1842/43)
The 1755 tsunami is also thought to have separated the small island of Aughinish, on the southern shores of Galway Bay from Co. Clare. The castle of Corranrue (Norman) was also damaged.