century BC, the Celts were slowly driven away by Germanic tribes (Marcomanni, Quadi, Lombards and possibly the Suebi), leading some to place the seat of the Marcomanni king, Maroboduus, in Závist. Around the area where present-day Prague stands, the 2nd century map drawn by Ptolemaios mentioned a Germanic city called Casurgis. In the late 5th century AD, during the great Migration Period following the collapse of the Western Roman Empire, the Germanic tribes living in Bohemia moved westwards and, probably in the 6th century, the Slavic tribes (Venedi) settled the Central Bohemian Region. In the following three centuries, the Czech tribes built several fortified settlements in the area, most notably in the Šárka valley, Butovice and Levý Hradec. The construction of what came to be known as Prague Castle began near the end of the 9th century, expanding a fortified settlement that had existed on the site since the year 800. The first masonry under Prague Castle dates from the year 885 at the latest. The other prominent Prague fort, the Přemyslid fort Vyšehrad, was founded in the 10th century, some 70 years later than Prague Castle. Prague Castle is dominated by the cathedral, which began construction in 1344, but wasn't completed until the 20th century. The legendary origins of Prague attribute its foundation to the 8th-century Czech duchess and prophetess Libuše and her husband, Přemysl, founder of the Přemyslid dynasty. Legend says that Libuše came out on a rocky cliff high above the Vltava and prophesied: "I see a great city whose glory will touch the stars." She ordered a castle and a town called Praha to be built on the site. The region became the seat of the dukes, and later kings of Bohemia. Under Duke of Bohemia Boleslaus II the Pious the area became a bishopric in 973. Until Prague was elevated to archbishopric in 1344, it was under the jurisdiction of the Archbishopric of Mainz. Prague was an important seat for trading where merchants from across Europe settled, including many Jews, as recalled in 965 by the Hispano-Jewish merchant and traveler Abraham ben Jacob. The Old New Synagogue of 1270 still stands in the city. Prague was also once home to an important slave market. At the site of the ford in the Vltava river, King Vladislaus I had the first bridge built in 1170, the Judith Bridge (Juditin most), named in honor of his wife