Father Leonard Eugene Boyle, OP, OC (November 13, 1923 – October 25, 1999) was an Irish and Canadian scholar in medieval studies and palaeography and was the first Irish and North American Prefect of the Vatican Library in Rome from 1984 to 1997.Born in Ballintra, County Donegal, Ireland. Boyle spent some years in Tralee following the death in 1940 of his older brother John. The latter was a member of the police (Garda Síochána) and drowned while on holiday in Ballybunion, Co.