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At the time of the [[Ultramar Campaign]] Messinius was the 10th Company Captain of the White Consuls and was leading a delegation to [[Ultramar]] to request aid for his Chapter's efforts at [[Thirteenth Black Crusade|Cadia]]. However he became caught up in the [[Terran Crusade]] and accompanied the newly reborn [[Primarch]] [[Roboute Guilliman]] to [[Terra]].{{Fn|1a}}

After surviving the journey to [[Terra]], he took part in the [[Battle of Lion's Gate]] against the [[Daemons]] of [[Khorne]]. In that battle, Messinius commanded a scratch [[Space Marine Company|Company]] of the Terran Crusade's surviving Space Marines and a number of the [[Palatine Guard]]. After By this point Messinius learned of the Daemons were defeated{{Fn|1}}, fall of his Chapter's Homeworld of [[Sabatine]] and was not sure if the White Consuls had even survived. Ultimately when the [[Indomitus Crusade]] began and Messinius joined its forces as a [[Lord Lieutenant]]. He was then given command of [[Indomitus Crusade Fleet Tertius]]' [[Battlegroup Saint Aster]], which he led during the [[Battle of Machorta Sound]].{{Fn|2}}