Sentinel (Zeta) Prime

Sentinel Zeta Prime was originally an officer in the Elite Guard before being named Prime. Under pressure from the various guilds of Cybertron he oversaw the rise of the caste system that came to dominate Transformer society, a policy which brought him into conflict with Alpha Trion, and ultimately led to the archivist's self-imposed exile in the Hall of Records. By the time of the rise of the Decepticon movement time had robbed him of much of the fire which had made him an effective military leader, and this left him out of touch with the people he claimed to represent.