- "Tarva, the Lord of Victory, and Alambil, the Lady of Peace, have come together in the high heavens."
- ―Glenstorm describing the stars and their significance.[src]
He was counted amongst the Old Narnians, but unlike many of his kind, he accepted Caspian X as their King quickly and loyally. Most likely he did this because he foresaw that things were about to change in Narnia, and believed Caspian was part of that prophecy.
He was a star-gazer and a prophet, and predicted that Caspian had come to wage a war against his uncle Miraz, and restore the rightful rule of Narnia to the Narnians. He was the leading Centaur in the Narnian Revolution, and was the General of the Old Narnian army.
Glenstorm also had three sons who fought alongside him during the war.
During the Battle of Miraz's Castle, he was one of the leading Narnian generals who led the Narnians into the castle, roaring out, "CHARGE!" as he stormed inside.
When the Telmarines did close the gate, and trapped most of the Narnians inside the castle courtyard, they also trapped Glenstorm's son, Rainstone, inside. He made it to the gate, looked out at everyone, but shouted at them to run and save themselves.
When he did this, Glenstorm and Rainstone shared a look, no doubt knowing what was about to come, before Glenstorm had to leave with the other retreating Narnians. There was no way to save his son or any of those trapped inside, and as a general he knew he couldn't risk so many lives to save one person, so, with a heavy heart, he fled with Caspian, Peter, Susan and the rest. His son did not survive.
When he returned to Aslan's How with his two surviving sons, he also carried Trumpkin with him, who had been gravely injured during the raid. He also shared a look with his wife, conveying the sad news of Rainstone's fate.
In the book; he is described as having a chestnut-coloured coat on his horse-half, and a long, golden-red beard that covered his broad chest on his human-half.
In the film; he has long, brown twined hair, with dark skin, a black coat for his horse-half, and a goatee beard.
After Caspian's coronation, it is believed he continued serving the young king as his General, and also as his tutor. He schooled Caspian in certain subjects, such as jousting.
- In the BBC film version of Prince Caspian, he is played by William Todd Jones.
- He is also shown leading soldiers into battle at the Second Battle of Beruna, and marches in the Coronation parade of King Caspian X.