Sometime before 1931, Marc and his brother, Eddie, joined the Royal Navy. By 1931, Marc was serving as commander aboard the HMS Hood. That year, while in service at a naval base in Invergordon, Scotland, Marc lead a mutiny aboard the ship. However, Eddie was sent in to put a stop to the mutiny, although he refused the order to execute Marc.
Afterwards, Marc was sent to the Russian front and ended his life in a gulag. Eddie subsequently took charge of Marc's family but left the Royal Navy, not finding his place there.
- Assassin's Creed: Conspirations (mentioned only)