Су Ши
Emperor Zhenzong had a dragon tail inkstone among his collection, which provoked further interest in them by Song literati. Su Shi considered them second only to Phoenix beak inkstones (鳳咮硯), at point trading a bronze sword for a dragon tail inkstone. In the 13th century Yao Mian (姚勉) wrote a poem about a dragon tail inkstone once opened by Su Shi: