[2]: 245 For a brief period in the early 12th-century, the see of Connor was united with Down under Máel Máedóc Ua Morgair (Saint Malachy), who also was Archbishop of Armagh.
[1] On 29 July 1439, plans for a permanent union of the two sees were submitted to King Henry VI of England for his sanction.
[3]: 344, 348 Exactly twelve months later, 29 July 1439, Pope Eugene IV issued a papal bull stating that Down and Connor were to be united on the death or resignation of either bishop.
[3]: 344, 348 In 1442, John Sely, Bishop of Down, was deprived of his see by Pope Eugene IV,[4][5] thereby effecting the union of the two dioceses.
[3]: 344, 348 However, due to strong opposition to the union in the diocese of Down, three more bishops of Down were appointed before the two sees finally united.