They spoke Norse, which is closest to Icelandic and Faroese.
The kashykians
English obviously
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.
Not at all. The Vikings were a Germanic people who inhabited modern-day Norway, Sweden and Denmark, while the Gauls were a Celtic people who inhabited modern-day France, northern Italy, and parts of Spain, Switzerland, etc. Vikings spoke a totally different language to the Gauls who spoke Gallic/Gaulish, which is related to Irish and Scottish Gaelic, while the Vikings spoke a language closely related to modern Norwegian, Swedish, Danish, German, etc. They had their own unique cultures, and their own ways of waging wars.
They spoke Ancient Greek. It was a language in and of itself.
The kashykians
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.
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.
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.
English. The British version is quite similar to Australian English.
The Vikings spoke Old Norse, a North Germanic language. Old Norse is closely related to other Scandinavian languages such as Danish, Swedish, and Icelandic.