Cato Sicarius is one of the most decorated and celebrated heroes of the Ultramarines Chapter, known for his boldness, martial prowess, and often arrogant self-confidence, which he backs up with immense skill as the Knight Champion of Macragge. Formerly the esteemed Captain of the Second Company and Master of the Watch, Sicarius earned countless honors commanding forces across numerous campaigns, including the Reclamation of Damnos against the Necrons, before eventually being lost in the Warp for five years following his reunion with Primarch Roboute Guilliman. Having survived his ordeal, he was later appointed the commander of the Victrix Guard, serving as the Primarch's personal bodyguard and trusted lieutenant, a role that channels his immense warrior talents into protecting the Lord of Ultramar.