The Lodge was founded by members of the Regiment in 1849 and has met regularly ever since. As such it is second only to the Mess Club in age as a sub-unit. The Secretary of the HAC at that time was William H White, who also served contemporaneously as Grand Secretary of the United Grand Lodge of England. Now, as then, the Lodge enjoys a close relationship with Grand Lodge, and its prestige in Masonic terms is in keeping with that of the Regiment and Company. FitzRoy is a leading lodge in the Circuit of Service Lodges.
Membership is drawn solely from the Regiment; all members must belong to the Company, and represents a similar span of ages.