Of the main dependence of the Western empire in its declining days on Africa, not merely for the necessary supply of food, but even for the chief resources and strength of the state in the midst of the desolation of its European fields, Sismondi gives a striking account--"The loss of Africa was at this period, (439 after Christ,) perhaps the greatest calamity which the empire of the West could have undergone. It was its only province the defence of which cost no trouble; the only one from which _they drew money, arms, and soldiers, without its ever requiring any back_. It was at the same time the granary of Rome and of Italy. The gratuitous distributions of grain at Rome, Milan, and Ravenna, had, over the whole Italian peninsula, destroyed the cultivation of grain. Experience had proved that the return could not pay its expense; and the reason was, that the more fertile fields of Africa furnished a part of the harvest destined for the nourishment of the people of Italy. The sudden stoppage of that supply by the conquest of Africa by the Vandals, caused a cruel famine in Italy; which still further reduced its wretched inhabitants."[58] And so entirely did Constantinople become dependent on foreign importation of sea-borne grain from Egypt and the Ukraine for its support, that "when the Persians, in the year 618, overran Egypt, and stopped the usual supplies of grain from that province, the famine became so alarming, that the government determined upon transferring _the seat of empire to Carthage_ in Africa, as the most likely point from whence the dominion of Syria and Egypt might be regained."[59] The latter of these had long been regarded as _the most valuable province of the empire_.[60]