Hugh de Lacy to arrest de Courcy and take his possessions. In 1205, de Lacy was made the first Earl of Ulster, founding the Earldom of Ulster, with which he continued the conquest of the Ulaid. The earldom would expand along the northern coast of Ulster all the way to the Cenél nEógain's old power-base of Inishowen. Until the end of the 13th century, the Dál Fiatach, still led by the Mac Dúinnshléibe, retained a fraction of their power being given the title of rex Hibernicorum Ulidiae, meaning "king of the Irish of Ulaid". The Gaelic title of rí Ulad, meaning "king of Ulster", upon the extinction of Dál Fiatach was usurped by the encroaching Ó Néills of the Cenél nEógain. Religion Ulaid was the location where the future patron saint of Ireland, Saint Patrick, was held during his early captivity. It is here that he made the first Irish converts to Christianity, with the Dál Fiatach the first ruling dynasty to do so. Patrick died at Saul, and buried at Dún De Lethglaise, which in the 13th century was renamed Dún Phádraig, which became Anglicised as Downpatrick. When Ireland was being organised into a diocesan system in the 12th century, the following dioceses where created based on the territory of the main dynasties of the Ulaid: the diocese of Down, based on the territory of the Dál Fiatach, with its cathedral at Bangor, however later moved to Downpatrick by John de Courcy; and the diocese of Connor, based on the territory of the Dál nAraidi. Around 1197 the diocese of Down was split in two with the creation of the diocese of Dromore, based on the territory of the Uí Echach Cobo, with its cathedral at Dromore. Principal churches/monasteries The chief churches, or more accurately monasteries, of the main sub-kingdoms of Ulaid were: Mag Bile (modern Irish: Maigh Bhile, meaning "plain of [the] sacred trees"), now known as Movilla in County Down. It was the chief church of the Dál Fiatach, and linked with their ecclesiastical origins, having been founded circa 540 by St. Finnian of Movilla, who was of the Dál Fiatach. The name Mag Bile suggests that this monastery was purposely built on the site of an ancient sacred tree. Bennchair (modern Irish: Beannchar, possibly meaning "place of points"), now known as Bangor in County Down. Built circa 555 or 559 by St. Comgall of the Dál