Q:Facts: - title: general - pinyin: tian xu - kingdom: cao wei - death date: -lrb- unknown -rrb- - simp: - trad: - birth date: -lrb- unknown -rrb- - name: tian xu - wg: tien hsu Based on these bullet points, write a short biography describing the life of tian xu .
A:
tian xu -lrb- birth and death dates unknown -rrb- was a military general of the state of cao wei in the three kingdoms period .