Varangian n. : One of the Northmen who founded a dynasty in Russia in the 9th century; also, one of the Northmen composing, at a later date, the imperial bodyguard at Constantinople.

Example:
Has anyone ever considered that Merovingian may actually mean Murdhach Varangian?

Taxonomy
Varangians, Varangian Guard, Byzantine, trade route from the Varangians to the Greeks, guard, Rus, Runestones, emperor, Scandinavians, loyalty, the Normans, the Emperor, Vikings, service, battle, Walls of Constantinople, Old Norse, foreigners.

Defination from the web:
Varangian Rus "to come and rule them" and bring peace to the region. ... A detachment of the Varangian Guard was sent and in the Battle of Cannae, the Greeks achieved a decisive victory. ...