What germanic kingdom provided a unified government after the fall of rome, spread christianity, and stopped the expansion of islam in europe?

ANSWER:

Germanic king Odoacer defeated Romulus Augustus, the last Roman emperor and conquered the western part of the Roman empire.  

EXPLANATION:

After the fall of Rome in 476 CE, it was divided into two parts: the Western part and the Eastern part. The Western part was taken over by the Germanic kingdom as Odoacer their ruler and the Eastern part was held together by the Byzantine kingdom. Constantinople was chosen as the "new capital of the Byzantine kingdom". Christianity flourished after the "fall of Rome" though it was not a widespread religion before the fall. The expansion of Christianity was a consequence of legalization of Christianity in the Byzantine empire and this led to the decrease in number or people practicing Islam. Hence, Christianity became a religion of the majority rather than earlier being a religion of a small minority.

The nickname would be : " robber bandits" i believe