qīng tài zǔ
posthumous title of Nurhaci 努爾哈赤|努尔哈赤[Nu3 er3 ha1 chi4] (1559-1626), founder and first Khan of the Manchu Later Jin dynasty 後金|后金[Hou4 Jin1] (from 1616)
清
qīng
(of water etc) clear; clean
太
tài
highest
祖
zǔ
ancestor