With a crusade, Ninoslav was baptized, only to abjure Christianity in 1233.
Among the propositions he could heartily abjure was that relating to transubstantiation; among those he felt constrained unflinchingly to maintain was one which had given great offence, to the effect that Christ, not Peter, is the head of the church to whom ultimate appeal must be made.
He was condemned to abjure or be burnt; and preferring the former alternative, was committed to the Fleet prison and afterwards to the Austin Friars in London.
The final judgment found no proof of heresy, but compelled him to abjure sixteen errors, rather extorted than extracted from his writings, suspended him from his see for five years, and secluded him to the Dominican cloister of Sta Maria sopra Minerva.
Yet even they did not abjure the " southern manner," and their work in it is matter of some critical significance, whatever may be said of its inferiority in spirit and craftsmanship.