Frederick II was King of Sicily from 1198, King of Germany from 1212, King of Italy and Holy Roman Emperor from 1220, and King of Jerusalem from 1225 to 1228. He was the son of Emperor Henry VI, of the Hohenstaufen dynasty, and Queen Constance I of Sicily, of the Hauteville dynasty. January 2, 1195 – December 27, 1250; died at 55. Alive at the same time as Thomas Aquinas, Rumi, Francis of Assisi, Fibonacci, and Genghis Khan. Wiki link