《资治通鉴·宋纪·宋纪十五》
庚寅，北魏任命南安王拓跋桢为都督凉州及西戎诸军事，兼护西域校尉，镇守凉州。
庚寅，魏以南安王桢为都督凉州及西戎诸军事，领护西域校尉，镇凉州。
On Geng Yin, the Northern Wei appointed King Tuoba Zhen of Nanan as the Governor of Liangzhou and Western Xirong military affairs, and concurrent guardian of the Xiyu military officer, to defend Liangzhou.