Set aside everything Western tradition teaches about dragons as hoarding, fire-breathing threats. The Dragon Kings of the Four Seas (四海龍王, Sìhǎi Lóngwáng) are something closer to responsible civil servants of the cosmos — four divine brothers, each governing one cardinal sea, together responsible for rainfall, rivers and every drop of water on which agricultural China genuinely depended.
Chinese folk religion assigns each of the four cardinal seas its own ruling Dragon King, elaborated fully during the Tang and Song dynasties into the bureaucratic divine hierarchy Chinese religion still maintains today. Each king is further associated with a colour, a season and one of the five classical elements.
Not hoarders, but administrators: the Four Dragon Kings receive their orders from the Jade Emperor and operate within a structured celestial bureaucracy — responsible officials of cosmic governance, not treasure-guarding monsters. Coastal Chinese communities historically prayed directly to them during drought, and their temples remain active pilgrimage sites today.
The eldest brother, Ao Guang, receives by far the most individual attention in Chinese literature — most famously in Journey to the West, where the mischievous Sun Wukong (the Monkey King) travels to Ao Guang's underwater palace and demands a weapon, ultimately walking away with the Ruyi Jingu Bang, a magically adjustable iron staff that becomes one of the story's most iconic objects. Ao Guang's underwater palace, built from crystal and coral and furnished with treasures rather than mortal food, is a recurring setting across Chinese mythological literature.
The Dragon Kings also appear in Buddhist scripture — the Lotus Sutra tells of Ao Guang's young daughter, Sagara, who achieves enlightenment after a chance encounter with a bodhisattva, becoming one of Buddhism's earliest and most notable examples of swift, direct spiritual attainment.
An honest note on temperament: despite their formal benevolent role, the Dragon Kings — Ao Guang especially — are frequently written as proud, easily offended and genuinely dangerous when provoked, capable of causing catastrophic floods or storms if disrespected. The Dragon Kings occupy a more psychologically complex space than "purely good" — closer to powerful, temperamental officials who reward proper respect and punish its absence, than to simple guardian figures.