Solomon Voss was a well-known wordsmith (writer) and instrumental as one of the preeminent founding members behind the creation of the Order of Remembrancers during the Great Crusade, to help witness and record the events of the founding of the Imperium of Mankind that would be available for later generations of Humanity. He initially served with the 63rd Expeditionary Fleet under the command of the Warmaster Horus of the Luna Wolves Legion, but transferred to another Imperial Expeditionary Fleet. When word reached the wordsmith of Horus' betrayal of the Imperium at Istvaan III, Voss sought out the newly renamed Sons of Horus, in order to gain understanding for the reasoning behind such treason and record what he witnessed, for future posterity.