The Third Company of the Relictors Chapter is a Space Marine Company.[Conflicting sources]
In 112.M33, it was commanded by Captain Excorius. The company was wiped out in battle against Rubric Marines on Aggaros.
In 998.M41, the Third Company deployed to Armageddon, along with the rest of the chapter, during the third war for the planet.
The following information is not to be regarded as officially sanctioned and/ or is not written from an in-universe point of view. A detailed explanation of the term "Trivia" as used in the Lexicanum can be found here.
The Feral War occurred in M33, but the Relictors chapter was known by their previous name, the Fire Claws, until M41 (around 150 years before the Third War for Armageddon).