The 13th century, the age of universities and cathedrals, was a time when Europeans journeyed to unknown realms and encountered different religions. It was also the age of Crusades. William of Tripoli spent his life and ministry in the world around Acre in the Latin Kingdom, a crossroads for art, trade, and contacts between Christians and Muslims. His writings offer not only a positive presentation of Muslim life and faith but also traces of a Christian theology of that religion.