What are the known Factions of ANCIENT Runeterra?

I'm trying to figure out what all the old factions of Runeterra were. Am I missing some faction? How much of the chronology is figured out yet?

• The Watchers' Iceborn, Northern Valoran
• Mordekaiser's Empire, Eastern Valoran
• The Blessed Isles, The Shadow Isles
• Icathia, Southwest of Valoran/Southern Continent
• Ancient Shurima, Southern Continent
• The Lunari, West of Southern Continent
• The Solari, West of Southern Continent
• The Protectorate, Unknown Location
• The Magelords, Unknown Location
• The Ruined King's Kingdom, Unknown Location
• Targonians, Space