Most probably that was a language similar to the one used by the Norsemen. Nowadays the most similar one would be Icelandic as an example of isolated medieval Norwegian.
They spoke Norse, which is closest to Icelandic and Faroese.
The kashykians
The Norse language was spoken by the Norse people, primarily in Scandinavia during the Viking Age (8th to 11th centuries). The language evolved into Old Norse, which eventually gave rise to modern Scandinavian languages like Danish, Swedish, and Norwegian.
The Vikings spoke a language consisting of words now used in some Scandinavian countries.
I think the English started "borrowing" the words that the Vikings and French spoke.
Armenian or Hebrew
English obviously
The Vikings spoke Norse.
The Minoans were from the island of Crete and the Myceneans were from mainland Greece and spoke an early form of the Greek language.
They only spoke in the same language.
Germanic languages were spoken by ancient Germanic tribes and later evolved into modern German, English, Dutch, and other languages. Some famous Germanic-speaking figures include the Anglo-Saxon warriors who invaded England, Charlemagne of the Franks, and the Gothic tribes in Eastern Europe.
The Rus tribe lived in what is now Russia long before the Vikings began their activities,, and they spoke a language completely unrelated to the Scandinavian languages of the Vikings.