Castle Brian

First constructed by the Terran Hegemony in 2391, each Castle Brian was a type of massive defensive fortress built on numerous worlds during the Hegemony and Star League eras.

While often mistakenly believed to have been built to prevent invasion or takeover of a planet, the static fortresses weren't meant to protect anything other then themselves and the forces contained within. With the limited resources of Terran Hegemony compared to the nations of the Great Houses and the later Star League's sheer size preventing blanket defense coverage of most worlds, a Castle Brian was intended to be a hindrance against a blitzkrieg invasion, storing enough weapons, food and men to allow any defenders to hold out and harass the invaders hopefully until reinforcements could arrive.

Each Castle Brian had a minimum of 20 heavily armed turrets carrying an assortment of direct fire and missile weaponry, mated to the massive passive strength of the fortress itself which was usually build deep inside mountain and safe from all but the heaviest nuclear or orbital bombardment. The majority of the Castles Brian were built on the border worlds of the Hegemony, with many worlds having multiple.

The term Brian Cache, a Clan equipment store usually one established during the demobilization process Kerensky created upon arriving in the Pentagon Worlds is derived from the Castle Brian fortresses.