What Did the Vikings Speak? Norse?

In the nine hundreds, there were vikings from lake norway, denmark. They lived in a shit place with no grass and a lot of lakes and rocks. And they got to france and were like, folk me, this is class. This is so much better than norway and denmark. So what we need to do is build brilliant boats and just go everywhere. We need to continually expand and take sit. But you know wha, my grandfather was a viking. And my grandfather came from this shady place where it was just rocks and rivers and very little grass. So i have this itchiness me, and i need to go and take some ships.