Also known as Ser Dontos the Red, he is made a fool by King Joffrey Baratheon after attending a tourney drunk.
Ser Dontos is a knight, and the only surviving member of House Hollard.
Dontos enlists in the tournament to celebrate King Joffrey Baratheon's nameday, and is set to fight Lothor Brune. When his bout is announced he emerges half armored and drops his helmet. He apologizes and Joffrey accuses him of drunkenness. Dontos denies the accusation but admits to drinking two cups of wine. Joffrey offers Dontos as much wine as he likes and Dontos accepts. Joffrey orders Ser Meryn Trant of the Kingsguard to ensure that Dontos drinks his fill. Trant and two of his sworn brothers hold Dontos down and pour wine into his mouth through a funnel. Sansa Stark cries out “You can't.” Joffrey is incensed, but she claims that she meant it would be bad luck for Joffrey to kill someone on his nameday. Joffrey is dismissive of this superstition until the Hound backs Sansa. Joffrey reluctantly orders Dontos to be imprisoned until the following day, planning to execute him then and calling him a fool. In an effort to spare Dontos from execution, Sansa says that Joffrey was clever to notice Dontos' foolishness and entreats him to prolong his suffering by making him the court fool.
Dontos is present at court, in his fool's regalia, when Joffrey orders Sansa publicly beaten for her brother Robb Stark's victory in the Battle of Oxcross. She is rescued partway through by the intervention of Hand of the King Tyrion Lannister.
During the Battle of the Blackwater, Dontos is present at Maegor's Holdfast. He juggles to entertain some of the highborn ladies refuged there.
Dontos follows Sansa to the Red Keep's godswood, where he thanks her for saving his life during Joffrey Baratheon's nameday celebration. As a gesture of his appreciation he gives Sansa a necklace strung with seven amethysts, which he tells her is a family heirloom worn by his mother and grandmother. Sansa tells him she will wear it with pride.
Dontos performs at the feast following the wedding of Joffrey and Margaery Tyrell. Bored with his performance, Joffrey offers a gold dragon to the person who knocks Dontos' hat off, resulting in Dontos being pelted with objects from all directions. Later, when everyone is distracted by Joffrey's fatal poisoning, Dontos approaches Sansa, convincing her to leave in order to save her life. Unlike the rest of those present, Dontos is neither shocked nor horrified.
The confusion from Joffrey's death gives Dontos and Sansa just enough time to flee the feast. Soon after Tyrion is seized for Joffrey's assassination, Queen Cersei orders Sansa arrested as well, only to find Sansa nowhere to be found. Hand of the King Tywin Lannister orders that no one be allowed to leave King's Landing. Despite this, Dontos and Sansa are able to make their way through abandoned alleys virtualy unseen, coming upon a small row boat. Dontos rows the two to a fog-shrouded ship and has Sansa board. On board is Petyr Baelish, who reveals to Sansa that the "family heirloom" that Dontos gave her was a fake and that Dontos rescued Sansa expecting payment from Baelish. Baelish double-crosses Dontos, "paying" him by ordering his death by crossbow, reasoning that he would talk eventually.
At Tyrion's trial, Pycelle testifies that Dontos' body was found, with the necklace Sansa wore at the wedding, and that a residue of a most rare and terrible poison was found inside.
Ser Dontos was the last surviving member of House Hollard, a family obliterated by Aerys II. Sansa Stark saved him from death after he offended King Joffrey during his nameday celebration. In gratitude, he helped Sansa escape after Joffrey's murder, only to be killed himself by Littlefinger.