O'Rourke (Irish: Ó Ruairc)[1] is an IrishGaelic clan based most prominently in what is today County Leitrim. The family were the historic rulers of Breifne and later West Breifne until the 17th century. The O'Rourke Clan Chief was at odds with the O'Reilly Chief because both clans contested each other for the title Prince of Breifne.[2]
^Newerkla, Stefan Michael (2020), Das irische Geschlecht O'Reilly und seine Verbindungen zu Österreich und Russland [The Irish O'Reilly family and their connections to Austria and Russia]. In: Diachronie – Ethnos – Tradition: Studien zur slawischen Sprachgeschichte [Diachrony – Ethnos – Tradition: Studies in Slavic Language History]. Eds. Jasmina Grković-Major, Natalia B. Korina, Stefan M. Newerkla, Fedor B. Poljakov, Svetlana M. Tolstaja. Brno, Tribun EU, pp. 259–279 (accessible online), here pp. 263–265.