Background
He was born in Warwickshire, and was educated and ordained priest in Spain.
He was born in Warwickshire, and was educated and ordained priest in Spain.
He was appointed rector of Liège in 1678, and on 4 December 1679 provincial of his order. He was reputed to be implicated in the Popish Plot. The 1680 pamphlet A Vindication of the English Catholics against the accusations levelled at the Jesuits in the fictitious Plot is attributed to him.
Warner claimed that Titus Oates had offered to sell to the Jesuits his manuscript narrative which later became the backbone of the alleged Plot, early in August 1678.
On the recommendation of Edward Petre, he replaced the Capuchin Father Mansuete as confessor to James II, in 1686. According to Maurice Ashley, Warner gave James moderate advice.
At the time of the Glorious Revolution in 1689 he followed James to France, though detained at Gravesend where he needed forged papers to escape. He died at Paris on 2 November 1692.