Danegeld

The Danegeld ( /ˈdeɪn.ɡɛld/; "Danish tax", literally "Dane Money"). Danegeld was a tax raised to pay tribute to the Viking raiders to save a land from being ravaged. It was called the geld or gafol in eleventh-century sources; the term Danegeld did not appear until the early twelfth century. It was characteristic of royal policy in both England and Francia during the ninth through eleventh centuries, collected both as tributary, to buy off the attackers, and as stipendiary, to pay the defensive forces.

Read more about Danegeld:  England