Wang Sengbian
"Dilong" first occurs in the mid-7th century CE "History of the Southern Dynasties" biography of Liang dynasty Admiral Wang Sengbian (d. 555 CE). It says witnesses saw "lianglong" "two/paired dragons" that ascended into the sky, and this "dilong" "earth dragon" leaving Liang territory was interpreted as a portent of their defeat in 550 CE. Ronan and Needham cite another context in Wang's biography that says his boat had "shuanglong" "two dragons" on the side, which they construe as a "literary emendation" for "shuanglun" "two wheels" describing an early paddleboat.