How did Leo III form an alliance with the Khazars?
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Leo III
Leo III, gold solidus from Constantinople, 717–741.
Emperor Leo III formed a valuable military alliance with the Khazars through a strategic marriage. In 733, he arranged for his son, Constantine V, to marry a daughter of the Khagan of the Khazars. This diplomatic union secured a military alliance in the trans-Caucasus region, which helped the Byzantine Empire counter the threat posed by the Arabs.1