|The Birthday Boy|
The great Andalusian philosopher/scientist/mathematician, the defender of philosophy who wrote the great response to al-Ghazali's attacks on it, may have had as much or even more influence on the intellectual tradition of Western Europe, which knew him as Averroes and received much of medieval Europe's knowledge of Aristotelianism through his work. He influenced Jewish philosophers including Maimonides) as well as Christian (Albertus Magnus, Thomas Aquinas, and the so-called Latin Averroists.
Dante could not bring himself to put Muslims in Purgatory or heaven, but he at least put Averroes and Avicenna (Ibn Sina) in Limbo, which was his outermost circle of hell.
And today, for his 888th, Averroes received perhaps the ultimate contemporary accolade: Google gave him one of its trademark "Google Doodles" (and explained it here):