Knattleikr is an ancient Viking ball game that dates back to the Viking Age. It is a team sport that involves two teams of players competing against each other in a fast-paced game of skill and strategy. The game is played on a rectangular field with two goals at either end
From Wikipedia
Knattleikr was an ancient Norse ball game mentioned in the Sagas of Icelanders. Ball games of the kind are recorded from across the world, and ultimately led to various modern sports.