House Merovic was a Loyalist Imperial Knight House of the Imperium. There is very little information in Imperial records about this Knight House, apart from their valiant last stand on the Fortress World of Praesidium Primus, where they fought against the impossible numbers of the Tyranids of Hive Fleet Leviathan and the countless mobs of the Orks under the leadership of the Overfiend of Octarius.