Viking hoards

As of 2015, more than 1,000 kilograms (2,200 lb) of silver from over 700 caches deposited between the 9th and 12th centuries have been found on Gotland. This includes 168,000 silver coins from the Arab world, North Africa, and Central Asia. Left: A Khazar silver coin.

Genetic research indicates that the Vikings (Danes) derive from Finnish stock from North East Asia. The Mari and the Samoyeds are the Finns who stayed in the place and did not migrate a thousand kilometers west. The Scandinavians beget the Germanic tribes that invaded the Roman Empire after its dissolution. The Russian people originated from the Finns. 

The Vikings produced nothing, built nothing, but sold blond slaves to the Greek and Muslim world. They were basically slavers. The enormous hoards found indicate their worldwide business interests and their wealth. 

Interestingly, the Achaeans from the Iliad were also known as Danae. They were seafaring people who raided maritime settlements and took slaves to be sold. That piratical livelihood was discovered and practiced in different places and eras.