Ibn Tumart
Towards the end of Ramadan in late 1121, in a particularly moving sermon, Ibn Tumart reviewed his failure to persuade the Almoravids to reform by argument. After the sermon, having already claimed to be a descendant of Muhammad, Ibn Tumart suddenly 'revealed' himself as the true Mahdi, the expected divinely guided justicer. He was promptly recognized as such by his audience. This was effectively a declaration of war on the Almoravid state. For to reject or resist the Mahdi's interpretations was equivalent to resisting God, and thus punishable with death as apostasy.