The Imperial Templars are a Loyalist Third Founding Space Marines Chapter derived from the Black Templars' gene-seed. The Imperial Templars origin can't be traced so their existence could be kept a secret. But since their creation they have been on many crusades, most on their own and some with the Black Templars. Like the Black Templars, the Imperial Templars are not Codex Astartes-compliant Chapter and maintain a very different Chapter structure and culture than what is considered the norm in most Astartes Chapters.