He was a Fellow of Trinity College and consecrated as Bishop of Kildare on 2 February, 1679 .
The officers of the manor consisted of a seneschal, registrar and marshal, who were appointed by the Bishop of Kildare, as Dean of Christ Church, Dublin.
Ellis was the second but only surviving son of the Most Reverend Welbore Ellis, Bishop of Kildare and Bishop of Meath.
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In 1976, the historic sees of Meath and Kildare were united (Kildare Diocese having for the previous century and a quarter been united with the neighbouring Dioceses of Dublin and Glendalough).
His consecration took place, at the hands of Archbishop Loftus of Dublin, Hugh Brady the Bishop of Meath, and Robert Daly the Bishop of Kildare, on 13 June 1568, in Christ Church Cathedral, Dublin.
Colgan tells us that he resigned the throne of Leinster in 591 (really, 592), and entered the great monastery of Kildare, where he served God for forty-eight years, becoming successively abbot of Kildare and bishop of Kildare.