Iron Dominion

The Iron Dominion is a gathering of Mobian clans under the command of the Iron King and Iron Queen. Including the Yagyu Ninja clan and others, this group formed in the Dragon Kingdom and fought against Monkey Khan before relocating to New Megaopolis to usurp control from the insane Dr. Eggman.

Defeating the Clans
In roughly 3236, the Clan Wars began between the Iron Queen, the Yagyu Ninja Clan, the Shinobi Clan, and the Bride of Conquering Storm's clan. Roughly a year later, the Yagyu's Clan's leader, the Bride of Rich Nights, was struck down by the Iron Queen, all the other clans swore their allegiance to her and the Iron Dominion, serving as their soldiers. (StH: #201)

Usurping the Eggman Empire
While the Iron King and Queen served as Sub-Bosses to the Eggman Empire over in the Dragon Kingdom with the local resistance there beginning to keep them at bay, the Iron Queen made romantic connections with Snively Robotnik over in New Megaopolis via the Egg Network. After the Iron King and Queen had finally managed to rid most of their oppressors, the leaders of the Iron Dominion, accompanied by the Yagyu Clan and Conquering Storm, arrived at the landing bay of the Eggdome via the Iron Queen's dirigible to usurp the Eggman Empire following Dr. Eggman's recent descent into insanity, and quickly began a search of the city to see if their were any other functioning buildings. (StH: #194, #200, #201)