 Christianity spread in the surrounding countryside from the end of the 5th century, and the first churches were built in the town only around the 6th century.After the collapse of the empire, the region fell into warring tribes which allied with the principal barbarian leaders, such as Uraias the Ostrogoth, who laid waste to Milan in 539.In 568 the Lombards entered northern Italy, giving the region its future name of Lombardy.