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Tyranthikos
From Warhammer 40k - Lexicanum

Tyranthikos[2]
The Tyranthikos, also known as the Dominators, were an elite cadre of line breakers and assault troops within the Iron Warriors Legion during the Great Crusade.[1]
Clad in Terminator Armour, each was a veteran of many bloody sieges. Each Grand Battalion of the Iron Warriors had a unit of Tyranthikos, and Perturabo himself used them as bodyguards in battle until their replacement by the Iron Circle.[1b]
The title itself seems to have its origins on Olympia. The twelve lords of Olympia were themselves referred to as the Tyranthikos[1a]
Notable Tyranthikos
Sources