Sarrum was a ruler of the kingdom of Amata, who came to Camelot in the episode The Hollow Queen. He unleashes an evil plot on Camelot, when Merlin is distracted by Daegal. He is also said to be the man who held Morgana captive for two years.
He arrived in Camelot to form an alliance with Arthur Pendragon. Arthur was warned by Gaius of Sarrum's reputation as a ruthless killer of innocent lives, however, the alliance was to ensure a certain battle against sorcery as Sarrum and Arthur were both enemies of Morgana Pendragon and Sarrum had even captured her for two years with Aithusa, her dragon.
While feasting with Arthur, Sarrum talked of his accomplishment of capturing Morgana. After being asked how he managed to do this, he explained that he tortured Aithusa, which caused Morgana much pain and sorrow. This allowed him to find a weakness within her and so he captured her, however, he confessed that a lapse allowed her to escape his grasp.
While practising combat, Arthur was defeated by Sarrum's personally trained soldier. Sarrum promised to maybe train him one day, when the alliance was fulfilled.
Secretly, Guinevere Pendragon wanted Sarrum to kill Arthur and asked him to meet her outside the court room. She requested him to shoot Arthur using his best man and she would reward him handsomely. Sarrum agreed to this and chose his personal soldier.
However, while signing the alliance pledges, he was mortally shot by Albin. Albin was supposed to assassinate Arthur; however, he lost his aim and shot Sarrum when? Merlin stabbed him using a spear with magic. Sarrum died there, and the now deceased Albin was blamed (The Hollow Queen).
- Sarrum was the man who held Morgana and Aithusa captive for two years. He seemed to delight in the fact that Aithusa was deformed.
- Sarrum is a strange character; he came to Camelot to sign a peace treaty, but was perfectly happy to plot to kill Arthur. However, he did not plan to kill Arthur beforehand.