The Heavenly King Hall, is specific to the ChineseBuddhism. It is named after the four heavenly kings.

The front of the Heavenly King Halll enshrines Maitreya
Bodhisattva, and the back is devoted to Skanda Bodhisattva.
Skanda Bodhisattva is one of the dharma protectors, or
dharmapalas in Buddhism. It is said that after Sakyamuni
Buddha’s nirvana, evil spirit had taken the Sarira, the relics from
cremated ashes of Buddha, and Skanda Bodhisattva chased
after the evil spirits and took them back. Thus in Buddhism he
is regarded as the God of protection. The Skanda Bodhisattva
dresses in golden armor, and holds a golden Vajra.