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were worn out with changes of government; and, though there remain great forts and mightily walled cities as a record of this rule, they are evidence in themselves of the turbulent times which shook the country. When, therefore, the first Arab invasion poured in, there was nothing to quell it, and for one last time Imperial Rome struggled for a moment, staggered and fell.

The first Arab invasion of the seventh century was more a series of raids than anything else. Mohammed had appeared and died, but his teaching had remained, and had inspired those bands of wild nomads to organize themselves. Persia, Syria, Egypt had fallen before the advance, and soon they began moving farther west. The most important of these raids was that led by Sidi Okba, who traversed the whole of Algeria and Morocco, and who, no doubt, would have gone on had he not been arrested by the Atlantic.

He was killed during his return journey by the Berber army under Koceila, and he is buried near Biskra, where his memory is venerated.

Hassan followed him, and finally drove the last Byzantines out of North Africa. Needless to say, the chief object of the invaders had been to convert the people to the new faith, and little by little the Berbers became Mohammedans. It did not take long for them to create dissension in these beliefs, but they remained generally under the law of the Prophet, respecting the principles even more rigidly than their conquerors.

However, the most important point of this conversion is that it created an Arab-Berber alliance for the further march of Mohammedanism into Europe. It is said that it was a Berber named Tarik who first crossed the Straits of Gibraltar, and it was after him that the rock took its name, Djebel el Tarik—the Mountain of Tarik.