Chinese culture
Chinese dragons are legendary creatures in Chinese mythology, Chinese folklore, and East Asian culture at large. Chinese dragons have many animal-like forms such as turtles and fish, but are most commonly depicted as snake-like with four legs. They traditionally symbolize potent and auspicious powers, particularly control over water, rainfall, typhoons, and floods. The dragon is also a symbol of power, strength, and good luck for people who are worthy of it in East Asian culture. During the days of Imperial China, the Emperor of China usually used the dragon as a symbol of his imperial power and strength. They are also the symbol and representative for the Son of Heaven, the Mandate of Heaven, the Celestial Empire and the Chinese Tributary System during the history of China.
Longma
"Longma" or "dragon horse" connects with other creatures in Chinese folklore. While "longma" sometimes applies to the Qilin (Williams 1989:390), the closest relative is the legendary "tianma" 天馬 "heavenly horse" or the "Chinese Pegasus", which was metaphorically identified with the "hanxiema" 汗血馬 "blood-sweating horse" or Ferghana horse. A poem attributed to Emperor Wu of Han celebrates a 101 BCE victory over Western tribes.
The Heavenly Horses are coming, Coming from the Far West. They crossed the Flowing Sands, For the barbarians are conquered. … The Heavenly Horses are coming; Jupiter is in the Dragon. Should they choose to soar aloft, Who could keep pace with them? They will draw me up and carry me To the Holy Mountain of K'un-lun. The Heavenly Horses have come And the Dragon will follow in their wake. I shall reach the of Heaven, I shall see the Palace of God. (tr. Waley 1955:96-97) 
In Chinese astrology, the Dragon and Horse are two of the twelve animals. A "Zhuangzi" (列禦寇) story mentions finding a "pearl worth a thousand pieces of gold" under the chin of a "lilong" 驪龍 "black-horse dragon".