An odd bit of historico-biographico-linguistic trivia, reported by Sam at Come here to me! (Dublin life & culture):
Vladimir Lenin, the Russian revolutionary, spoke with a Dublin accent. Well, according to Roddy Connolly, son of James, who said in a 1976 Irish Times feature that Lenin, more specifically, had a “Rathmines accent”. This was due to the fact apparently that Leinin was taught English in London (c. 1902) by an “Irish tutor, who had lived in Leinster Road”.
There’s more detail on the history and the accent at that link and at the Dublin Review of Books.