Actually, the special province defenders are not in the DB (the items are, though).
These are the special guardian commanders and the sites they are guarding that I can remember:
- Bolivar the Illusionist (Bolivar's Tower of Reflections)
- Anre the Eternal Knight (Holy Crypt of Anre)
- Katafagus the Lich
- Ptah the Divine Mummy (Desert of Ptah)
- Solaris the Paladin
- Sativa the Sorceress (Twice Walled Tower?)
- Tiamat the Wyrm
- Oberfuehrer the Hoburg Hero (Hoburg)
- Polyperchon the Cyclops (Mine of the Cyclops)
- Starke the Ice Druid (Stakre's Ice Cave)
- King of the World (Throne of the World)
- Great Mother & naked Lord of Fertility (The Primal Forest)
- Golem
EDIT: Updated Anre to the list.