Zosimus, New History 6.06
Zosimus (Greek Ζώσιμος): Early Byzantine, pagan author of a history of the Roman Empire, published in the first quarter of the sixth century CE.
The translation of Zosimus' New History offered here was printed in 1814 by W. Green and T. Chaplin in London, and was probably prepared by J. Davis of the Military Chronicle and Military Classics Office. The translator is anonymous. The text was found at Tertullian.org. The notes were added by Jona Lendering.
[6.6.1] Thus happened this revolt or defection of Britain and the Celtic nations, when Constantine usurped the empire, by whose negligent government the barbarians were emboldened to commit such devastations. In the meantime, Alaric, finding that he could not procure a peace on the conditions which he proposed, nor had received any hostages, once more attacked Rome, and threatened to storm it if the citizens refused to join with him against the emperor Honorius.
[6.6.2] They deferred their answer to this proposal so long, that he besieged the city, and marching to the port, after a resistance of some days, made himself master of it. Finding that all the stores of the city were there, he threatened to distribute them among his men, unless the Romans should accede to his terms.
[6.6.3] The whole Senate having therefore assembled, and having deliberated on what course to follow, complied with all that Alaric required of them. For it would have been impossible to avoid death, since no provisions could be brought from the port to the relief of the city.