Context : Yuan Zhen (Chinese: 元稹; pinyin: Yuán Zhěn; Wade--Giles: Yüan Chen) (779 -- September 2, 831), courtesy name Weizhi (微之), was a politician of the middle Tang Dynasty, but is more known as an important Chinese writer and poet. 
Subject : Yuan Zhen 
Relation : sex or gender
Which sex or gender can Yuan Zhen be described as?