Mongavlin Castle, Medieval fortress on River Foyle in County Donegal, Ireland
The stone fortress stands on the western bank of River Foyle, measuring 50 feet in length and 25 feet in width across three levels.
The castle served as the residence of Finola MacDonnell, wife of Hugh O'Donnell, who arrived with 100 Scottish guards from the Crawford clan in the 1500s.
The structure's name originates from Maghgaibhlin in Irish, referring to the geographical feature of a small fork in the surrounding plain landscape.
The remaining portions of the castle walls stand approximately three miles south of Saint Johnston village, accessible through local country roads.
King James II wrote a letter proposing surrender to Derry from this castle in 1690, during his military campaign in northern Ireland.
Location: County Donegal
GPS coordinates: 54.90417,-7.45333
Latest update: March 3, 2025 08:01
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