楷书四大家 (楷書四大家) kǎishū sì dà jiā

kǎishū sì dà jiā proper noun The four great masters of regular script
Domain: Modern Chinese 现代汉语 , Subdomain: Art
Notes: Namely, 颜真卿 Yan Zhenqing, Ouyang Xun 欧阳询, Liu Gongquan 柳公权, and Zhao Mengfu 赵孟頫