The duration of the Soudanese empires, moreover, will bear comparison with that of others which are better known to fame. Ghana enjoyed an independent existence of about eleven hundred years--that is, a period nearly equivalent to the period of existence of the British Empire from the abolition of the Saxon Heptarchy to the present day. Melle which succeeded Ghana had a shorter national life of about two hundred and fifty years. Songhay counted its kings in regular succession from 700 to 1591--a period which almost equals the life of the Roman Empire from the foundation of the republic before the Christian era to the downfall of the empire in the second half of the fifth century. The duration of Bornu was less reputable. The civilization represented by these empires was no doubt, if judged by modern standards, exceedingly imperfect. "The principle of freedom, as we understand it, was probably unknown; authority rested upon force of arms; industrial life was based upon slavery; social life was founded on polygamy. Side by side with barbaric splendor there was primeval simplicity. Luxury for the few took the place of comforts for the many. Study was devoted to what seems to us unprofitable ends. Yet the fact that civilization, far in excess of anything which the nations of northern Europe possessed at the earlier period of Soudanese history, existed with stability enough to maintain empire after empire through a known period of about 1500 years in a portion of the world which mysteriously disappeared in the sixteenth century from the comity of modern nations."[23] Bent holds that "three hundred years before the Portuguese came to this country the natives were ruled over by a chief with the dynastic name of Nonomapata. From the evidence brought forward we are well within the range of probability when we say that in various parts of Africa there has been a very close approach to well-ordered government dating from ancient days. That these governments are non-existent today can not be laid to their discredit nor to their faulty organization. It is a fact that the earth has not produced the government that could very long defy the ravages of time. A journey down the wreckstrewn highway of the ages will reveal the dry bones of a thousand empires and it is not surprising that the humbler states of Africa can be numbered among them. The fact that there are evidences of decadent states in tribal Africa has its parallel in various parts of Europe today."