三曹

the Three Caos (Cao Cao 曹操 and his sons Cao Pi 曹丕 and Cao Zhi 曹植), who established the Wei or Cao Wei dynasty 曹魏, and were all three noted poets and calligraphers

three / 3

surname Cao / Zhou Dynasty vassal state

class or grade / generation / plaintiff and defendant (old) / government department (old)