Gregor Eisenhorn is one of Warhammer 40k’s most famous Inquisitors, a man who started as a Puritan and ended up a Radical. His long career, chronicled in Dan Abnett’s novels, shows how easily the line between serving the Imperium and betraying it can blur.
Who is Gregor Eisenhorn?
Born on DeKere’s World in 198.M41, Eisenhorn joined the Inquisition as an interrogator under Inquisitor Hapshant around 219.M41. He became a full Inquisitor in 222.M41, at just 24 years old.
He served the Ordo Xenos, the branch that deals with alien threats. Early on he was a Puritan of the Amalathian faction, believing in strict adherence to Imperial doctrine. Over time, though, his methods and beliefs shifted dramatically toward Radical Xanthism.
From Puritan to radical
Eisenhorn’s slide toward radicalism wasn’t sudden. It came from decades of facing threats that the strict Puritan playbook couldn’t handle. He began using forbidden knowledge and artifacts, believing the ends justified the means.
His peers in the Inquisition grew suspicious. He was declared a rogue agent at least twice, but both times he was cleared and proven righteous. That pattern says a lot about his character: he’s willing to cross lines, but he’s not a traitor.
Key cases and companions
Eisenhorn’s career is defined by a handful of major investigations. In 240.M41 he hunted down the mass-murderer Murdin Eyclone on Hubris, which brought Godwyn Fischig and Alizebeth Bequin into his retinue.
That same case set him on the trail of Pontius Glaw and the Necroteuch, a dangerous Chaos tome. Later he led a mission to stop Inquisitor Quixos, a Radical who’d gone too far.
- Murdin Eyclone: a mass murderer Eisenhorn killed on Hubris.
- Pontius Glaw: a Chaos-corrupted figure linked to the Necroteuch.
- Quixos: a Radical Inquisitor Eisenhorn was sent to stop.
- Godwyn Fischig: a loyal companion who joined after the Eyclone case.
- Alizebeth Bequin: a key ally and member of his retinue.
Why Eisenhorn matters
Eisenhorn is a fan favorite because his story asks hard questions about power and morality in the grimdark future. He’s not a hero in the traditional sense, but he’s not a villain either.
His journey from Puritan to Radical mirrors the Inquisition’s own internal tensions. For readers new to 40k, his novels are often recommended as a gateway into the setting’s tone and lore.
Key facts
- Born in 198.M41 on DeKere’s World.
- Became an Inquisitor in 222.M41 at age 24.
- Served the Ordo Xenos.
- Started as a Puritan, became a Radical Xanthite.
- Declared rogue at least twice but cleared both times.
- Central figure in Dan Abnett’s Eisenhorn novels.
FAQ
What is Gregor Eisenhorn known for?
He’s a famous Inquisitor of the Ordo Xenos whose career spanned the 3rd and 4th centuries of M41. He’s known for his shift from Puritan to Radical and for starring in Dan Abnett’s novels.
Is Gregor Eisenhorn a Radical or a Puritan?
He started as a Puritan of the Amalathian faction, but over time he became a Radical Xanthite. Some of his peers even considered him heretical.
Who are the main members of Eisenhorn’s retinue?
Key members include Godwyn Fischig and Alizebeth Bequin, who joined during the Murdin Eyclone case. His retinue changed over the years as allies came and went.