- You may be looking for the Godfather-lieutenant responsible for the Gregorian Compact.
Four Godfather-lieutenants were the original followers of Grandfather Paradox. None of them were ever named or properly described.
They were thought to have discovered the abomination's graveyard by stepping through the caldera, and their oversized suits of armour each displayed the features of different species. According to Faction legend, their shadows bore not only multiple shadow-weapons but also armour. (PROSE: The Book of the War)
One Godfather-lieutenant led the delegation to the court of British king George II that resulted in the signing of the Gregorian Compact. He notably performed the "Shadow Dance". (PROSE: The Book of the War, COMIC: Bêtes Noires & Dark Horses)
The Book of the War speculated that these lieutenants provided the Celestis with the tools needed to erase themselves from time, as had previously been done to Grandfather Paradox himself. (PROSE: The Book of the War)