Powerful Predecessors of Power-Ring Protectors

An interesting and not widely known aspect of the history of Earth-Two's Green Lantern, Alan Scott, was the one occasion when he was transported to the 12th century of Camelot by a fake Merlin. Trapped in that era and now powerless, Scott was given his ancient power battery to recharge his power ring by a visiting Chinese delegation of lamas from Tibet who guarded it. In November 1945, one of those ambassadors of China contacted Alan from within that same battery to warn him of the impending return of his old foe, Solomon Grundy.

Hal Jordan as Earth-One's Green Lantern encountered the doppleganger of the first Lama who was named Myrwhydden, a powerful enemy of Hal's predecessor Abin Sur whom Sur emprisoned within his power ring. Myrwhydden would try again and again to escape Jordan's ring unsuccessfully.

In July 1968, another lama met the Psycho Pirate, with the costumed criminal seemingly stealing a green globe in the lama's possession. 

This globe contained remnants of the liquid metal from the original Green Flame meteorite. The Pirate ultimately gained the ability from its energies to mentally manipulate Alan Scott into doing his bidding. In fact, the lama whom the Pirate had "stolen" the globe from was the designer of Green Lantern's power battery... an immortal Chinese lampmaker named Chang. He manipulated the Pirate into claiming the globe, in order to tap into the battery's power, since both the globe and battery were crafted from the same Starheart meteorite. This allowed Chang and his Green Dragon Tong to access the Green Flame energy to now use its energies for evil, although their scheme was thwarted by Green Lantern.

Abin Sur's counterpart was the primary lama ambassador named Volthoom, who presented the battery to Scott in Camelot. Along with his confederate, the doppleganger of Myrwhydden, the pair were said to have "given" Scott the Green Lantern battery (Alan previously came into possession of the 1940 version of the battery via a Mister Billings). 

The other two lamas present in Camelot were the cosmic twins of earlier Green Lanterns who had protected Earth-One before Jordan appeared, the cowboy Daniel Young aka the first Green Lantern of Earth-One and Tomar-Re of planet Xudar-One who later mentored Hal. Young was Abin Sur's replacement in 1873 when that Green Lantern had been temporarily incapacitated.