Excerpts from Books and Wikipedia
"By 410 the city of Rome was no longer the capital of a great empire. The center of Roman power had shifted east to Constantinople, and in the west Emperor Honorius had moved his court to Ravenna on Italy's Adriatic coast. . . . Because of the siege, food supplies in Rome were largely exhausted. After three days, then, the Visigoths left the starving city, heading south toward grain-rich Sicily. Alaric died later in the year at Cosenza." [1001 Days]
"Both sides of the empire were now threatened by a previous ally of Theodosius: Alaric, commander of the Gothic regiments at the Battle of the Frigidus. . . . Rather than continuing to struggle for Roman privilege, Alaric took control of his Gothic army and made himself its supreme commander and leader. In doing so, he managed to create a newborn nation and become its first ruler: king of the Visigoths. . . . After nearly two decades of wandering, the Visigoths finally had a homeland." [Bauer: Medieval World, p. 91-3]