The German connection was further strengthened by placing Bohemia under the supremacy of the Archbishop of Maintz; Thietmar, a German, became the first Bishop of Prague. This worthy was succeeded after a few years by a native of Bohemia, Adalbert, who finally established Christianity in the country. He had a hard task, as many heathen customs, such as polygamy, were difficult to extirpate; there are even in this day very few churches dedicated to St. Anthony, a saint who does not seem to interest or convince the Bohemians. Adalbert carried his ideals farther afield, to the country of the heathen Prussians, who killed him for trespassing on ground dedicated to one of their deities. Adalbert became the third saint and martyr of Bohemian origin, and was adopted by the Poles as patron saint. Though there are no buildings other than those on the Hradšany mentioned by the chroniclers, we may assume that a township was growing up by the river at the feet of the Castle Hill. We have the testimony of Ibrahim Ibn Jacub, who speaks of Prague as "a great commercial town of stone-built houses." Ibrahim's visit must have taken place in the reign of Boleslav II. I conclude that he was talking of a town on the left bank of the Vltava, because others of his race who came here in that Prince's day are said to have been allowed to found a school in the Mala Strana quarter. Some fifty years later yet more Jews came to Prague bringing presents for the ruler, Prince Vratislav, and Bishop Gebhard. They were allowed to build twelve little houses on the outskirts of the town, which would be somewhere about the Harrachove. These Jews promised to be of good behaviour and to pay double taxes, but in three months their numbers had increased to seven hundred, so half of them were ordered to go out over the river to where the old town now stands; another Jewish settlement was established there. The advent of these visitors is proof positive that Prague was becoming not only habitable but also a place of importance. CHAPTER V In which good and bad rulers of Bohemia make or mar the fortunes of the country, the points being chiefly in favour of the good rulers, despite the constant intrigues, quarrels and general misconduct of the Přemysls.