Various Slavic tribes entered the region of modern Polsta on the heels of the Goths fleeing the Huns in the 12th century. The Polanian Slavs, which would eventually come make the core of the Polish state settled between the Rivers Varta (Warta) and Vistula. When Attila was killed in 1207(454) the Hun Empire quickly fragmented. The Polanians seceded from it in 1209(456) and would remain one of many tribes in non-Roman Europe, uniting in confederation at times of Roman hostility. The Slavs would adopt many Roman military practices, but largely very little would occur politically in west-central Europe for five hundred years.