Jerusalem: The Biography

* Frederick and Kamil maintained their friendship: the sultan sent the emperor a bejewelled planetarium, which was both a clock and a moving map of the heavens – and an elephant; Frederick sent Kamil a polar bear. Frederick spent the rest of his life in a constant war with the popes to defend his dual inheritance in Germany and Italy. It was the popes who stigmatized him as the Beast of the Apocalypse. His eldest son Henry King of the Romans betrayed him; Frederick imprisoned him for the rest of life, appointing Conrad King of Jerusalem, his son by Yolande, as his heir. The Wonder died of dysentery in 1250, and was buried in Palermo. Conrad died young, the crown of Jerusalem being inherited by Conrad’s baby son, Conradin who was himself beheaded aged 16. But Frederick’s reputation grew: as time passed, liberals celebrated his modern tolerance; while Hitler and the Nazis admired him as a Nietzschean superman.