The garrison were massacred when they surrendered to Parliamentarian troops on September 11th, 1649.
In the early 1800′s the earlier fortifications were demolished and replaced by a Martello tower as part of a series of defences erected along the Irish Coast by teh British in expectation of an invasion by Napoleon Bonaparte.
This mythical colony would have been established by Leif Ericson around the same period as the settlement at l’Anse aux Meadows, in the Canadian province of Newfoundland and Labrador, the most famous site of a Norse or Viking settlement in North America outside Greenland.
Butternuts found in the Newfoundland site had already suggested that the Norse had explored the continent because they do not grow naturally north of the Canadian province of New Brunswick, hundreds of kilometers away from any known Viking settlement.
In 1669 Oliver Plunkett was appointed Archbishop of Armagh and Primate of All-Ireland.