Vikings:
Date: 800's to 1100's.

Instead of fighting the Vikings, some English kings preferred to pay them to leave in peace. These payments were called 'Danegeld' (meaning 'Danish debt, payment or tribute ). The Vikings collected tribute in other countries too. In Ireland in the 9th century they imposed a tax and slit the noses of anyone unwilling or unable to pay, and that is the origin of the English phrase 'to pay through the nose' meaning to pay an excessive price.

Danegeld:
Circa: 1000.

Etymology: Middle English gilde, from Old Norse gildi payment, guild; akin to Old English gield tribute, guild or more at geld.

Vice-Kings:
Date: 14th century.

The Chakri dynasty up to 1885 every king had a vice-king (Maha Upa-raja, also translated as second king), usually the brother of the king and the designated heir to the throne - however Rama II was the only former vice-king who actually ascended to the throne. When the vice-king died before the king, the title often remained vacant for several years. The system was abolished by the King of Siam Chulalongkorn when his vice-king Bovorn Vichaicharn died. He then declared his oldest son the crown prince, but not vice-king.

Vice-roy:
Date: 1524.

Etymology: Middle French vice-roi, from vice- + roi or king, from Old French rei, roi, from Latin - rex or Royal. 1 : the governor of a country or province who rules as the representative of a king or sovereign.

Vikings were Vice-Kings of Danish Royalty that raided parts of Europe...