List of Space Marine Chapters - I: NameOriginFoundingNotesIllustriansUnknownUnknownThis Chapter undertook the disastrous Imperial Abyssal Crusade into the Eye of Terror in 321.M37, where it was corrupted by the Ruinous Powers and eventually became the Chaos Space Marine warband known as The Black Psalm.Immortal HeartsUnknownUnknownThe Immortal Hearts is a Loyalist Space Marine Chapter of unknown Founding and origin.Imperial CastellansUnknownUnknownThe Imperial Castellans is a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin.Imperial FistsN/AFirst FoundingThe Imperial Fists is one of the First Founding Chapters of the Space Marines and was originally the VII Legion of the Legiones Astartes raised by the Emperor Himself from across Terra during the Unification Wars. The Imperial Fists stand out from other Space Marine Chapters since it possesses no fixed homeworld, although it is most frequently based on Terra. Instead, the Imperial Fists rely on their 10,000-year-old mobile space fortress, Phalanx, to serve as their mobile fortress-monastery.Imperial HarbingersUnknown23rd FoundingThe Imperial Harbingers is a Loyalist Space Marine Chapter of unknown origin, created during the 23rd Founding, the so-called "Sentinel" Founding, in M37. This Chapter hails from the world of Birmingham, "the Black Planet," so named because it receives very little visible light. The Imperial Harbingers are specialists at drop assaults.Imperial HawksUnknownUnknownThe Imperial Hawks is a Loyalist Space Marine Chapter of unknown origin and Founding. It specialises in fast attacks from the air, utilising high-altitude Jump Pack-assisted assaults, followed by reinforcement sorties from squadron-strength units of Land Speeders, often dropped at altitude and at high-speed from Thunderhawk gunships.Imperial PaladinsUnknownUnknownThe Imperial Paladins is a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding.Imperial RavagersUnknownUnknownThe Imperial Ravagers is a little-known Loyalist Space Marine Chapter. Its fortress-monastery is a space station that orbits the world of Vindict V. Sometime during M41, it was summoned by the Inquisition to perform an Exterminatus upon the Genestealer-infested planet of Stalinvast.Imperial StarsUnknownUnknownThe Imperial Stars is a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding.Imperial TalonsRaven Guard (suspected)UnknownThe Imperial Talons is a Loyalist, Codex Astartes-compliant Space Marine Chapter. It is suspected that it is one of the rare Successor Chapters of the Raven Guard.Imperius ReaversUltramarines4th FoundingThe Imperius Reavers is a Fourth Founding Successor Space Marine Chapter of the legendary Ultramarines, created sometime during M32 or M33. The Chapter's homeworld is the Hive World of Praedis Zeta, located in the Vidar Sector, which is further located in the farthest edge of the Eastern Fringe. This volatile region is under constant siege by the twin threats of both xenos and the daemon.InceptorsUltramarinesSecond FoundingThe Inceptors is a Loyalist Codex Astartes-compliant Space Marine Chapter. It is a Second Founding Successor Chapter of the Ultramarines Legion. It participated in the Macharian Crusade, and was involved in a regrettable incident during the Macharian Heresy in the early years of M41.InculcatorsUnknownUnknownThe Inculcators is a Loyalist Space Marine Chapter of unknown Founding and origin.InterceptorsUnknownUnknownThe Interceptors is a Loyalist Space Marine Chapter of unknown Founding and origin.InvadersImperial FistsUnknownThe Invaders is a Loyalist Codex Astartes-compliant Space Marines Chapter of unknown Founding and a Successor Chapter of the Imperial Fists. Its Chapter homeworld of Ogrys was lost to an assault by the Asuryani of Craftworld Alaitoc approximately a standard century ago and the Invaders have been forced to become a fleet-based Chapter while they rebuild their strength from the heavy losses they suffered against the vengeful xenos.InvictorsUnknownUnknownThe Invictors was a formerly Loyalist Space Marine Chapter of unknown Founding and origin. It was corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what it endured during its sojourn into the Eye, but by the time it made its way back into realspace, it had become a Chaos Space Marine warband known as The Unhallowed.InviolatorsUnknownUnknownThe Inviolators is a Loyalist Space Marine Chapter of unknown Founding and origin.Iron ChampionsExecutionersUnknownThe Iron Champions is a Space Marine Chapter that is a Successor Chapter of the brutal Executioners. For their role in combating the apostates and traitors of the Plague of Unbelief in M36, the Executioners were granted the rare honour of having a new Chapter, the Iron Champions, being created from their gene-seed in a later Founding.Iron CrusadersUnknownUnknownThe Iron Crusaders is a Loyalist Space Marine Chapter of unknown Founding and origin. The Iron Crusaders were last seen in 998.M41 heading towards the forbidden region of space known as the Ghoul Stars.Iron DrakesUnknownUnknownThe Iron Drakes was once a Loyalist Chapter of Space Marines which was corrupted after entering the Eye of Terror in 321.M37 as part of the disastrous Abyssal Crusade. At some point during their sojourn in the Eye, the Iron Drakes were corrupted by Nurgle on the Daemon World of Anathrax and became the Grey Death, ready and willing to spread their plague across the stars.Iron Drakes (Salamanders)SalamandersUltima FoundingThe Iron Drakes is a Loyalist Space Marine Chapter and a successor of the Salamanders composed entirely of Primaris Space Marines that was raised during the Ultima Founding of ca. 999.M41 by Archmagos Dominus Belisarius Cawl.Iron FistsImperial Fists22nd FoundingThe Iron Fists is a Codex Astartes-compliant Loyalist Chapter which is a Successor Chapter of the Imperial Fists, formed in M37 during the 22nd Founding.Iron HandsN/AFirst FoundingThe Iron Hands is a Loyalist Space Marine Chapter and one of the original First Founding Space Marine Legions created from the gene-seed of its martyred Primarch, Ferrus Manus. When the Horus Heresy erupted, the Iron Hands were nearly annihilated during the Dropsite Massacre of Istvaan V and their Primarch was slain by the traitorous Fulgrim, Primarch of the Emperor's Children. Since that time, the Iron Hands have grown to believe that human flesh is weak and easily corruptible, and strive to replace their organic bodies with more "pure" bionic substitutes, thus closely emulating the faith of the Adeptus Mechanicus' Cult of the Machine.Iron HawksUnknownUnknownThe Iron Hawks is a Loyalist Space MarineChapter from an unknown Founding that is a Successor Chapter of the Ultramarines. The Iron Hawks are currently recovering from heavy losses after a particularly long and gruelling campaign.Iron HeartsUnknownUnknownThe 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.Iron HoundsUltramarinesUnknown (4th Founding suspected)The Iron Hounds is a Loyalist Space Marine Chapter and successor of the Ultramarines of unknown Founding. Renowned for their relentlessness, the Iron Hounds are ruthless warriors who pursue their enemies until every last foe has been slain.Iron KnightsImperial FistsSecond FoundingThe Iron Knights is a Second Founding Successor Chapter of the Imperial Fists. The Iron Knights was one of the many Loyalist Space Marine Chapters who participated in the defence of Cadia from Abaddon the Despoiler's offensive during the 13th Black Crusade.Iron LordsIron HandsUnknownThe Iron Lords is a rare Successor Chapter of the venerable Iron Hands Chapter, created in M38 during an unknown Founding. It has gone on to play major roles in combating aggressive xenos species including the Barghesi, the Tyranids and the T'au.Iron RavensRaven GuardUltima FoundingThe Iron Ravens is a Loyalist Space Marine Chapter comprised entirely of Primaris Space Marines, created from the lineage of the Raven Guard and raised during the Ultima Founding of 999.M41. The Iron Ravens are specialists in sudden, shocking drop assaults.Iron SceptersUnknownUnknownThe Iron Scepters is a Loyalist Space Marine Chapter of unknown Founding and genetic origin.Iron ShieldUnknownUnknownThe Iron Shield is a Loyalist Space Marine Chapter of unknown Founding and origin. Much of this obscure Chapter's history has been lost and is not recorded in current Imperial records.Iron SnakesUltramarinesSecond FoundingThe Iron Snakes is a Second Founding Loyalist Space Marine Chapter of the Ultramarines, though it is not a Codex Astartes-compliant Chapter. The Iron Snakes Chapter's primary task is to guard a cluster of Imperial solar systems known as the Reef Stars close to their homeworld of Ithaka, which are infrequently plagued by Orks, and more frequently by the Dark Eldar.Iron TalonsWhite ScarsUnknownThe Iron Talons is a Loyalist Space Marine Chapters that was created from White Scars gene-stock during an unknown Founding. It was founded as part of the Astartes Praeses -- one of the 20 Chapters of Astartes mentioned in the ancient tome known as the Mythos Angelica Mortis that was created to defend the regions surrounding the Eye of Terror in the Segmentum Obscurus from the forces of Chaos.