Vikings, Longboats and Fjords. 'Nuff said.
Sassanid Empire.
Lol, Rheinlander, they were not some random Muslims, they were the second-largest Muslim empire ever, and they were the most powerful superpower of the 8th and 9th century (the vast empires of Heraclian and the Tang dynasties being defeated). They don't have any connections with suicides either.