[The text is quite long but you are able to quickly glean the most important points:]
The Varangians trace their lineage back to bands of mercenaries who contracted themselves to the Empyrean throne in bygone years. "Varangian" is an old Empyrean word relating to "one who swears an oath". These early Varangians fought using unusual (to the southern kings) tactics and weapons, and were thus placed in high esteem by Empyrean generals.