Question: When did Princess Li Jingshou's husband die?
Sentence (from "Princess Li Jingshou"): When he was subsequently defeated and killed in 420 by the Northern Liang prince Juqu Mengxun, the Western Liang capital Jiuquan (酒泉, in modern Jiuquan, Gansu) fell to Northern Liang, and Princess Dowager Yin and Li Jingshou were captured.
Relevant evidence: No