Genoa followed, but sunk, after great efforts, under the power of her rival; while Venice remained mistress of the sea, of a large dominion upon the continent, and of the Indian spice trade, the origin and support of all her greatness. Rhodes, and the ships of the Military Order of St John of Jerusalem, to whom that island belonged, greatly harrassed the maritime trade carried on by the Moors in their own vessels from Alexandria, who were every day more discouraged by the unexpected progress of these _once petty_ Christian states. Trade again began to be carried on by caravans in the desert. Large companies of merchants from Arabia, passed in safety to the western ocean, and were joined by other traders from the different parts of Barbary while passing to the southward of them, and that with such security and expedition, that the Moors began to set little value on their manner of trading by sea, content now again with the labours and conveniencies of their ancient, faithful friend, and servant, the camel. Ormus, a small island in the Persian Gulf, had, by its convenient situation, become the market for the spice trade, after the discouragements it had received in the Mediterranean. All Asia was supplied from thence, and vessels, entering the Straits of Babelmandeb, had renewed the old resort to the temple of Mecca. From hence all Africa, too, was served by caravans, that never since have forsaken that trade, but continue to this day, and cross the continent, in various directions. John I. king of Portugal, after many successful battles with the Moors, had at last forced them to cross the sea, and return vanquished to their native country. By this he had changed his former dishonourable name of _bastard_ to the more noble and much more popular one of John the _avenger_. This did not satisfy him. Assisted by some English navigators, he passed over to Barbary, laid siege to Ceuta, and speedily after made himself master of the city. This early connection with the English arose by his having married Philipina of Lancaster, sister of Henry IV. king of England, by whom he had five sons, all of them heroes, and, at the taking of Ceuta, capable of commanding armies. Henry, the youngest, scarce twenty years of age, was the first that mounted the walls of that city in his father’s presence, and was thereupon created Master of the Order of Christ, a new institution, whose sole end and view was the extirpation of the Mahometan religion.