From Tolkien Gateway
The Middle Kingdom was a long-established realm in the midlands region of England. It was the domain of King Augustus Bonifacius. One of the villages within the realm was called Ham and there lived Farmer Giles.
King Augustus Bonifacius was not a good ruler of the land. He was greedy, uncaring of his heirlooms, and kept a retinue of worthless knights. Eventually his misrule led to Farmer Giles' decision to establish himself as an independent lord and eventually the king of the new Little Kingdom. Due to the tamed dragon Chrysophylax that Giles had in Ham, Augustus Bonifacius was unable to prevent the separation of Giles' realm from the Middle Kingdom.