German’s tribes were at place, where is Czech republic and other sates now, to the 5th century AD. Then Slavonic tribes came from the east and reached place of Czech republic in th 6th cen.
In the 7th century Sámo’s empire arose. Sámo was franc merchant won became ruler of Slavonic. After his death his empire fell down.
In time between 7th and 9th centuries lived famous Czech princes, like Přemysl a Libuše.
Prince Mojimír I established new empire called Velká Morava in 830. Mojimír’s nephew Rostislav ruled after him. He invited evangelists Konstantin (Cyril) and Metoděj in 863. They evangelized, translated Bible and made character for Slavonic called Hlaholice. During the reign of Mojimír II was Velká Morava destroyed by Hungarians.
Czech state formed by Bořivoj I. at the end of the 9th century became successor of Velkomoravská říše ( Big Moravian empire). Bořivoj was the first ruled of Přemysl dynasty.