Manuel II Palaiologos or Palaeologus was Byzantine Emperor from 1391 to 1425. Shortly before his death he was tonsured a monk and received the name Matthew. He is commemorated on July 21.
In a lecture delivered onSeptember 2006, Pope Benedict XVI quoted from a dialogue believed to have occurred in 1391 between Manuel II and a Persian scholar and recorded in a book by Manuel II in which the Emperor stated Show me just what Muhammad brought that was new and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached. Many Muslims were offended by this denigration of Muhammad, and many protested against it. For others it may simply have been false indignation or the assumption of offence by nonMuslims. In his book, Manuel II then continues, claiming that, God is not pleased by blood and not acting reasonably is contrary to Gods nature. Faith is born of the soul, not the body. Whoever would lead someone to faith needs the ability to speak well and to reason properly, without violence and threats... To convince a reasonable soul, one does not need a strong arm, or weapons of any kind, or any other means of threaten
Source: Wikipedia