The Kuzari (Kitab Al Khazari) was written by the Spanish Jewish philosopher Yehuda Halevi around 1140 A.D. The book tells the story of a Khazar king and a Jew, who was sent to instruct the King of Judaism.  The Kuzari is both a wonderful piece of classic Jewish literature, as well as a loosely based historical description of the Khazars being converted to Judaism.  A table of contents is included for easier navigation.