Although Bishop Montgomery and Ó Dochartaigh had been on good terms before the rising (both had quarrelled with Sir George Paulet, the Governor of Derry, who is often blamed for provoking the rebellion), the rebels burnt the Bishop's house and his library of two thousand books because of their supposedly heretical content.
Though he was frequently accused, even by the Crown itself, of neglecting his pastoral duties, he was a fine administrator and an astute man of business.
He did much to strengthen the Church of Ireland in Ulster, and accumulated a comfortable private fortune, which passed by marriage to the St Lawrence family.
[10] After his death in London in 1620/21, his body was taken back to Ireland and buried at Ardbraccan Church, near Navan in County Meath.
[11] He married twice: He was praised in his time as "no lazy bishop nor idle patriot" and was called the "darling and chief advocate of the Church of Ireland".