Chapter Master - Ultramarines: Marneus Augustus Calgar - Current Chapter Master of the Ultramarines, Lord Macragge, and Regent of Ultramar. Calgar is one of the most accomplished Chapter Masters within all of the Adeptus Astartes. His number of deeds and acts of valour fill twenty-eight volumes of Imperial records, a deed only surpassed by his Primarch Roboute Guilliman. With the recent resurrection of Guilliman in 999.M41, Calgar offered eternal fealty to his Chapter's primarch, and bequeathed full control of the Chapter to him in perpetuity. As a practical matter, Guilliman relies on Calgar to continue to lead the Ultrmarines in all day-to-day operations, and though Guilliman has retaken the title of Master of Ultramar, Calgar, and all future Ultramarines Chapter Masters, will be known as the Lord Defender of Greater Ultramar.Ollonius - Ollonius led the Ultramarines Chapter in the early 36th Millennium. During that time, he received a fragmented Imperial distress call form Sylphis II. Faced with sparse intel on the nature of the threat, Ollonius had to maximise the flexibility of the Ultramarines' response. He therefore assembled a Gladius Strike Force. Command was given to 3rd Company Captain Calistes, supported by Chaplain Gaius. Drawing on available forces, the strike force incorporated a Battle Demi-company of the 3rd, three squads of 1st Company Terminators, three squads of 10th Company Scouts, and several tank squadrons under Techmarine Agmannus. Upon making planetfall on Sylphis II, Calistes and his men found the world beset by greenskins, but with each component of the strike force working in perfect concert, the Ultramarines were able to purge the world of its xenos invaders.Agnathio - Agnathio was the Chapter Master of the Ultramarines during the 600s.M32. In 646.M32, he famously united over fifty leaders from other Chapters of the Adeptus Astartes and arrived upon Terra. Such a show of power and faith puts an end to the squabbling for the contentious seats of the High Lords of Terra that had consumed the differing factions since the lamentable events of The Beheading. In locked council with the mightiest of Mankind's warriors, such matters were quickly sorted. None knew exactly what was done or said, but when the Space Marines departed back to their far-scattered missions, there were once again twelve High Lords of Terra. If there was further dissension, none dared spoke it aloud.Odaenathus - Odaenathus was the Chapter Master of the Ultramarines during the 32nd Millennium. He helped to lead his Chapter against the vast WAAAGH! of the Ork Warlord known as The Beast, during the War of the Beast in 544.M32. During the First Invasion of Ullanor, he led his Chapter in the invasion of the Ork capital of Gorkogrod on the world of Ullanor and confronted The Beast in his personal Gargant. However, he was easily killed by a single strike of the massive Ork Warlord's fists, and became the first Chapter Master to personally die at the greenskin leader's hands.Marius Gage - Marius Gage, known as the "First Master", was the Terran-born First Chapter Master of the Ultramarines Legion's elite 1st Chapter, Master Primus of the XIII Legion and Equerry to Primarch Roboute Guilliman during the Great Crusade and Horus Heresy. Upon Guilliman's death at the Battle of Thessala and subsequent internment in the Shrine of the Primarch in 121.M31, Marius Gage assumed the burden of command and took on the duties of the Ultramarines Chapter Master.