Custodian Tribune - 41st Millennium: Heracleon, Tribune of the Hetaeron Guard - Heracleon is a Tribune within the the Adeptus Custodes who commanded the Hetaeron Guard during the 13th Black Crusade. It was  during that time that the name of Shield-Captain Valerian came to him in a dream -- a matter of great import, as Custodes were rarely capable of dreaming. In fact, Heracleon was the first Custodes in a millennia to do so and he felt that this signified that Valerian was a candidate to join the depleted ranks of the Hetaeron Guard. Shockingly, however, Valerian failed in his first trial to join the Companions of the Emperor, as he was physically unable to make himself enter the Sanctum Imperialis of the Golden Throne which held the Emperor's ravaged body.Italeo - Italeo was a Tribune within the the Adeptus Custodes who commanded the Custodians who protected the walls of the Outer Palace, during 13th Black Crusade. He was later mortally wounded while fighting in the Battle of Lion's Gate when the forces of Khorne used the onset of the Noctis Aeterna after the birth of the Great Rift to launch a great assault upon the Imperial Palace, but managed to kill one of the Bloodthirsters leading the Khornate legions before he was slain. Following Italeo's death, Maldovar Colquan was chosen to replace him as Tribune.Maldovar Colquan, Tribune of the Stratarchis - Following Tribune Italeo's death at the Battle of Lion's Gate, Colquan was chosen to replace him as a Tribune in the Adeptus Custodes and served as the liaison between Lord Commander of the Imperium Roboute Guilliman and Captain-General Trajann Valoris. Colquan joined the Indomitus Crusade's Fleet Primus and led its Adeptus Custodes contingent for over a solar decade, including taking part in the Battle of Raukos, which signaled the end of the first phase of the crusade with the stabilisation of the Imperium Sanctus. While Colquan served alongside Guilliman, the primarch noted that the Tribune's time on Terra had dulled much of his strategic sense, and he displayed a level of disdain for unaugmented mortal Humans that deeply disturbed Guilliman. Unlike most of the other Custodians, Colquan maintained a barely concealed rage towards those he considered his inferiors and was not known for his diplomacy when dealing with other Imperial officials. He also deeply distrusted both Guilliman and the new Primaris Space Marines, seeing them as usurpations of the Emperor's perfect works. Colquan later directed Shield-Captain Achallor to Gathalamor to conduct reconnaissance in reaction to Asuryani Farseer Illiyanne Natasé's vision of a threat from Chaos growing there that could threaten the whole Imperium. Colquan strictly instructed Achallor to only report on what he found on Gathalamor, not wishing for any of the Ten Thousand to expend their lives in fighting a threat that could be faced by other Imperial forces. However the Shield Host of Achallor soon became swept up in the fighting against the forces of Chaos present there, and at the climax of the battle Colquan arrived with a force of 50 Custodians which dramatically turned the tide of the campaign. After hearing of Achallor's death and burial on Gathalmor with the trappings of an Imperial Saint provided by the Ecclesiarchy, Colquan saw the superstitious ritual as a necessary act to exert control over the Imperium's population and maintain morale in the face of the growing threats to the galaxy. Colquan came to believe that he had seen the hand of the Emperor in how the campaign on Gathalamor had played out to the Imperium's advantage. During the Plague Wars Colquan remained at Guilliman's side, and remained highly critical of the increasingly militant religious movements growing up around the primarch such as those led by the priest Mathieu. During the climax of the Plague Wars campaign against the Daemon Primarch Mortarion and the Death Guard on Iax the Tribune organised an operation to rescue Guilliman and other Imperial servants from the doomed world before the orbiting fleet unleashed an Exterminatus action.