Longma (simplified Chinese: 龙馬; traditional Chinese: 龍馬; pinyin: lóngmǎ; Wade-Giles: lung-ma) was a fabled winged horse with dragon scales in Chinese mythology. Seeing a longma was an omen of a legendary sage-ruler, particularly one of the Three Sovereigns and Five Emperors.
The Chinese word longma combines long 龍 dragon and ma 馬 horse.
Kong Anguo's Shujing commentary explains the longma.
A dragon horse is the vital spirit of Heaven and Earth. As a being its shape consists of a horse's body, yet it has dragon scales. Therefore it is called 'dragon horse'. Its height is eight ch'ih five ts'un. A true dragon horse has wings at its sides and walks upon the water without sinking. If a holy man is on the throne it comes out of the midst of the Ming river, carrying a map on its back. (tr. Visser 1913:58)
A longma revealed the Hetu to Fu Xi or Shun, and the shell of a gui 龜 tortoise revealed the Luoshu to Yu. The Great Treatise commentary to the Yijing explains.
Heaven creates divine things; the holy sage takes them as models. Heaven and earth change and transform; the holy sage imitates them. In the heavens hang images that reveal good fortune and misfortune; the holy sage reproduces these. The Yellow River brought forth a map and the Lo River brought forth a writing; the holy men took these as models. (tr. Wilhelm and Baynes 1967:320)
The (10th century CE) Taiping Yulan says a longma that appeared in 741 CE was considered as a good omen for Emperor Xuanzong of Tang.
It was spotted blue and red, and covered with scales. Its mane resembled that of a dragon, and its neighing was like the tone of a flute. It could cover three hundred miles. Its mother was a common horse which had become pregnant by drinking water from a river in which it was bathed. (tr. Visser 1913:59)
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