The earliest inhabitants of the area lived in the valley of the Vltava river around 500 BC. Slavonic tribes came to Bohemia in about 500 AD. There is a legend about how the town of Prague started. Princess Libuše, the leader of a Slavonic tribe, chose a simple peasant Přemysl to be her husband. She told him to go and find a village on the banks of the Vltava and to start a town there. The town became Prague, ruled by the Přemyslid family.In the second half of the 9th century the castle’s original fortifications were built. During the reign of Wenceslas I (Václav in Czech) in the 10th century the church of St Vitus was built at Prague castle. Wenceslas was murdered by his brother when he was going to church. He was later made a saint. In the early 11th century the Přemyslid family got power in Moravia, too. Vratislav II was the first monarch to be called King of Bohemia.