Born into a poor Irish family, Fergus joined the army in order to escape his hellish life conditions. Despite his good services, promotions didn't follow, partly because he didn't always obeyed orders when he could put some gangsters in line.
One night in Liverpool, he met his future sire, who embraced him and than left him. After working as a mercenary for various Kindred, Xaviar made him into an Archon. Faced with the diminishing of his humanity, he eventually fled into the wilderness, trying to find a way to reconcile with his Beast.
There, he met Celeste, one of the last surviving followers of the Path of Harmony. In exchange for protection, he was tutored and eventually initiated into the path. Since then, he has returned to Europe and continues to work as an Archon, keeping tabs with some of the local princes.
Chaining the Beast, p. 116-117, 119