Why did Theodosius I make a triumphant visit to Rome in 389?

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Theodosius I visited Rome in 389 to make a triumphant entry following his military victory over the usurper Maximus in 388.1

After defeating Maximus, Theodosius remained in Italy until the spring of 391, residing primarily in Milan. By conducting this triumphant visit to the city, accompanied by his four-year-old son Honorius, Theodosius sought to emphasize his claim to supreme authority throughout the entire Roman Empire.1