Heraclius recovered much of the Byzantine Empire by 622 by defeating

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Heraclius won a series of battles against the Sassanid Persian Empire, which had previously conquered much of the Byzantine Empire, in the early 7th century. This resulted in the recovery of many territories, including Syria, Armenia, and Egypt. There is no historical evidence that Heraclius directly defeated Seljuk Turks, Visigoths, Merovingians, or Muslims during his reign.

Heraclius Recovered Much of the Byzantine Empire by 622 by Defeating