The Iron Hearts is an obscure Loyalist Space Marine Chapter of unknown Founding and origin. Its supposed Primarch is mentioned in Imperial records as "Primarch Rubineck". This is now believed to be a transcription error by an unwitting scribe of the Administratum who was actually referring to the Iron Hearts' Chapter Master.
The removal of this Chapter's name from official Imperial records may be a result of a daemonic incursion that occurred during some unknown point in Imperial history. According to official sources a Greater Daemon managed to gain entrance to the Iron Hearts Chapter's training centre via the possessed body of a failed Space Marine Aspirant. The Chapter was all but annihilated fighting the daemon who manifested fully within its star system. Only two companies, the 6th and 10th, remained at full strength. The ultimate fate of this Chapter is unknown.
The Iron Hearts' Chapter colours are not listed in current Imperial records.
The Iron Hearts' Chapter badge is not listed in current Imperial records.
In the short story "Hell in a Bottle", the character Rubinek was presented as a Primarch. It is clear, in light of more recent canon, Rubinek was not actually a Primarch, but rather the Iron Hearts' Chapter Master. There was once fan speculation that Rubinek might have been one of the Lost Primarchs from either the II or XI Legion, but Games Workshop has confirmed that this is not so, as they are unwilling to ever release any definitive information in regards to those two missing Space Marine Legions. The original purpose for these "deleted" Legions was so that players would be able to develop their own, custom Astartes Legions. Often, many of Games Workshop's earlier novels, such as the one from which this story was drawn, were still in the early stages of developing what would later be considered official canon. Much of the material utilised in these earlier novels is now considered non-canon and sometimes comical by present standards.
- Into the Maelstrom (Anthology) edited by Andy Jones and Marc Gascoigne, "Hell in a Bottle" by Simon Jowett