(c.1470-1565), Ethiopia , echage or abbot of Dabra Libanos , origin as trader from Yemen ; his Anqasa Amin [Gateway of Faith] (c.1533), written in Ge'ez , defends Christianity contra Islam, citing the Qur'an, and is addressed to the Muslim invader Ahmad Gran . Theodor Bibliander [Buchmann] (1506–1564), Swiss ( Zurich