Gregor Clegane

Full Name

Gregor Clegane


The Mountain That Rides, The Mountain, Tywin Lannister's Mad Dog, Robert Strong


Keep the Lannister's in power


Reanimated as an undead corpse

Ser Gregor Clegane is an antagonist in the A Song of Ice and Fire novels, as well as Game of Thrones. He is the elder brother of Sandor Clegane and the head of House Clegane, which are knights for House Lannister. Gregor is known for his massive size and brutal nature.

In the TV series, he was portrayed by actors Conan Stevens, Ian Whyte, and Hafþór Júlíus Björnsson.



Gregor was known for his violence even from a young age. When he was around twelve years old, he held his brother Sandor's face against a fire in retaliation for playing with one of his discarded toys without his permission, leading to Sandor's facial scars. Throughout the years, numerous servants have gone missing in the Clegane household, apparently killed by Gregor in moments of rage. He is also rumored to have killed his father, sister, and wives. At the behest of Tywin Lannister, Gregor was knighted by Prince Rhaegar Targaryan.

One year later, during Robert's Rebellion, Gregor participated in the Sack of King's Landing, where he met Elia Martell and her children, Rhaenys and the infant Aegon. Gregor proceeded to brutally murder the two, slamming Aegon's head against the wall, before raping and murdering Elia.

Season 1

Gregor is involved in the celebration of Eddard Stark's appointment as Hand of the King. During a joust, he horrifies the crowd by killing his opponent, Ser Hugh of the Vale. Later on, upon facing Ser Loras Tyrell, Gregor is enraged when he loses the joust, and is on the verge of killing Loras when Sandor intervenes and battles his elder brother. The fight is cut short when King Robert demands an end to the folly, to which a humiliated Gregor relents and leaves.

When Tyrion Lannister is taken into custody for the supposed attempted assassination of Prince Brandon Stark, Gregor is dispatched to the Riverlands in retaliation. This leads to numerous raids of villages, with its occupants being tortured and murdered en mass by Gregor's men. Eddard promptly declares Gregor a false knight and sentences him to death for his brutality, but the ruling is rendered null and void by Eddard's arrest and execution.

After Robb Stark's victory at the Whispering Woods, Lord Tywin commands Gregor to lead an invasion of the Riverlands in retaliation.

Season 2

Leading the Lannister's army, Gregor leads a brutal war campaign against the Riverlands, raiding villages and selecting prisoners at random to be tortured for information. Lord Tywin joins Gregor's men during the campaign a day before schedule, interrupting Gregor during one of his torture sessions. Tywin puts a stop to the torture and orders that the prisoners be put to work instead.

Following the assassination of Ser Amory Lorch, Tywin fears that he was the intended target and, out of paranoia, orders Gregor to execute dozens of their own men. Gregor suggests that the assassin was a member of the Brotherhood Without Banners, and Tywin dispatches Gregor to the smallfolk of the Riverlands to pressure the residents into giving up the Brotherhood. Tywin then returns to the Westerlands.

Season 3

When Robb Stark and his army arrive at Harrenhall, they discover that Gregor and his army have already executed the hundreds of prisoners, leaving their bodies to rot.

Gregor later participates in the Battle of Stone Mill against Lord Edmure Tully, Robb's uncle. His forces are defeated, forcing Gregor to retreat to Casterly Rot. Robb chastises his uncle, explaining he wanted to lure Gregor into the west and kill him there.

Season 4

During a trial by combat hosted by Tyrion Lannister, Gregor is appointed the Crown's champion by Cersei in an attempt to deter anyone from fighting for Tyrion. Eventually, Prince Oberyn Martell volunteers to duel Gregor, wanting to avenge the rape and murder of his sister Elia at Gregor's hands years ago.

Gregor duels Oberyn at the trial by combat, wielding heavy plated armor and a large sword. Despite his superior strength and size, Gregor is quickly overwhelmed by Oberyn's speed and agility. Oberyn manages to gain the upper hand in their duel, injuring the Mountain by driving his spear into his chest, seemingly incapacitating him. With Gregor downed, Oberyn demands that Gregor confesses to his murder of Elia and reveal who orchestrated it. However, Gregor takes advantage of Oberyn's hauteur to unexpectedly launch an attack that catches his opponent off guard. With Oberyn at his mercy, Gregor begins brutally gouging out his eyeballs, while at the same time exclaiming his murder of Elia for all those to hear. He then crushes Oberyn's skull, killing him. With Oberyn's death, Tywin announces that, according to the rules of the trial by combat, Tyrion is sentenced to death.

Despite killing Oberyn, Gregor's victory proves to be short-lived, as Oberyn had previously coated his spear with manticore venom, thus poisoning Gregor. The Mountain is forced to suffer from the excruciating poison, and Grand Maester Pycelle tells Cersei that he is beyond the point of helping. However, expelled maester Qyburn arrives, telling Cersei that he may be able to save him, though he warns Cersei that his unorthodox methods may "change" him.

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