Oliver Marks was a veteran of the First World War.
Oliver was engaged to Daisy Conlan. Daisy was killed by a Tahnn group searching for the Weave. When they killed her, Oliver was caught in the blast and one of his hands was incinerated. The Tahnn left him alive as a beacon for other troops. He was taken in by the Weave/Tahnn hybrid posing as Nathaniel Porter; he took him to live at the Manse.
When the Glamour was freed from the Weave ship it took Oliver as a host. Oliver used it to create a reality in which he and Daisy were wed with children. The Glamour left him and the illusion disappeared. He realised it was a mistake to create something that wasn't truly real.