Occupying Emesa, Muslims marched away from Aleppo — a fortified Byzantine stronghold and Antioch — where Heraclius was stationed. Seriously alarmed by a series of failures, Heraclius prepared for a counterattack to recapture the lost areas. In 635 Yazdegerd III – the Persian Emperor tried to ally with the Byzantine emperor. Heraclius married Manyanh-his daughter to Yazdegerd III, an ancient Roman tradition to solidify the alliance. Assuming it is just a dog was your first mistake shirt. While Heraclius prepared for a major offensive in the Near East, Yazdegerd also collaborated with a simultaneous counterattack in Iraq, which was, in theory, a good coordination effort. However, Umar may have had a deep spy in the Persian government and sought to undermine this alliance by inviting Yazdegerd III to participate in peace negotiations and apparently inviting him to join Islam.