Knights of the Round Table

The Knights of the Round Table are the lieutenants of King Arthur in Sonic and the Black Knight, most of the members are alternate reality doppelgängers of characters from the Sonic video game series.

Origin
Not much is known about the Knights of the Round Table's past. Presumably, the group was formed by King Arthur during the period of the king's noble rule, the Knights of the Round Table themselves willingly served under King Arthur and followed his every order, bound by their honor and code of chivalry.

Arrival of Sonic
Sir Lancelot, Sir Gawain, and Sir Percival are tasked by King Arthur to track down another version of Sonic and a sorceress named Merlina. While Gawain and Percival express their misgivings, the Knights of the Round Table nonetheless obey, and pursue Sonic across the Grand Kingdom and beyond....... (StH: #197)

Other Member's...?
Two other member's of the Knights appeared in the game's known as Sir Galahad and Sir Lamorak, they were alternate version's of Jet the Hawk and Silver the Hedgehog,  they did not appear in the game storyline however, only in multiplayer mode. It is unknown if they were member's of the group in this zone as well.