Vengeful Paladins

Forsaken to the fringes of Imperial space the Vengeful Paladins are charged with the protection of a mere handful of Human settled worlds of insignificant importance to the Imperium. Yet even on the outskirts of Segmentum Tempestus the Paladins must stand against the rising tide of xenos assaults and the machinations of the Warp.
The chapter operates without the support of the Adeptus Mechanicus and is shunned by fellow chapters of Astartes. Very rarely in the Paladins history have they fought alongside another chapter of Space Marines and 'Inspections' undertaken by agents of the Inquisition are more frequent than in any other chapter and are always conducted alongside the Praetor. What has caused this 'banishement' is lost to history, or perhaps only known to the Praetor Armageddon, but the shame felt by the Paladins is so great that they frequently launch Penitent Crusades to prove their worth to the Emperor.
A Chapter of unknown founding the Paladins records date as far back as M33, however references of this chapters activities have been found dating further back than this in the archives of other organizations of the Imperium, such as the Imperial Guard. Curiously when such records are found outside of the chapter they are often deleted or redacted under Inquisitorial seal.