Hargellus
From Warhammer 40k - Lexicanum
Hargellus was an Ultramarine who served during the Horus Heresy.[1]
He was part of the Imperial guerrilla forces that fought beneath the surface of Calth in the Underworld War. Serving under Captain Vultius, Hargellus was killed in an ambush on Vultius's command centre by a force of Word Bearers led by the Dark Apostle Kurtha Sedd.[1]