The chief protagonist in the fragments of the Old Czech Alexandreida is usually interpreted as a hero embodying the virtues of a sovereign. This study offers an alternative reading in a comparison with Gautier de Châtillon’s Alexandreida and Ulrich von Etzenbach’s Alexander. The passages set in Troy, Jerusalem and Libya show that the Old Bohemian Alexander rises high only to fall again. This fall is not brought about by any prideful intemperance, as in other versions, but takes the form of a betrayal of the sovereign ruler, the Lord, which mirrors the betrayal to which succumbed Alexander’s father Philip and is underpinned by the fickleness of Alexander’s gigantesque heart.