How did Leo III strengthen his alliance with Artavasdos?

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Leo III strengthened his alliance with Artavasdos, the commander of the Armeniakon theme, by marrying his daughter, Anna, to him. This strategic union followed their earlier cooperation in refusing to recognize the emperor Theodosius III, a move that helped Leo eventually seize the throne. Throughout Leo's reign, this alliance ensured that Artavasdos remained the second most powerful figure in the empire, largely due to his control over several critical military posts.1