From ErfWiki

An Overlord is a Ruler that is not a Royal.

Proposed Canon

Known Overlords include:

• Stanley the Tool of Gobwin Knob
• Charlie of Charlescomm
• King Slately of Jetstone
• Don King of Transylvito

Formerly (deceased)

• King Banhammer of Faq (Killed by Stanley)
• King Saline IV formerly of Gobwin Knob (Killed by Gobwins, succeeded by Stanley)