Mathew Paris furnishes us with an idea of King John’s religious
principles: he informs us that when John’s subjects saw no other way
of treating him but by taking up arms against him, whilst the former
appealed to the Pope, the latter appealed to Admirallus, King of Morocco,
a Mahometan, promising to surrender his crown and kingdom to him, and
hold them from him as his vassal; and likewise to renounce the Christian
religion, as vain; and faithfully to adhere to the Mahometan religion.
Admirallus rejected the offer with scorn. See also Prynne and Tovey.