Northern Song official and prose writer who, with 欧阳修, led the early 古文运动, the return to the plain prose of the Han and Tang. He also served on the frontier against the Western Xia.
When 范仲淹 was banished in 1036 for criticising the chancellor, Yin told the throne that Fan was his friend and teacher, so he belonged to Fan's 'faction' too. He was demoted along with him.
usage
洙 is a rare character naming the 洙水, a river at Confucius's home in Lu, and his courtesy name 师鲁, 'take Lu as teacher', points the same way: both nod to Confucius.