Taiyuan (617) — the same event in History of the Northern Dynasties and Book of Sui

History of the Northern Dynasties: Duke Tang, Li Yuan, raised a volunteer army at Taiyuan.; Book of Sui: The Duke of Tang (Li Yuan) raised a…

What each source says

Duke Tang, Li Yuan, raised a volunteer army at Taiyuan.

甲子，唐公起義師於太原
Location: 北史卷12 大業13年

The Duke of Tang (Li Yuan) raised a volunteer army at Taiyuan.

唐公起義師於太原
Location: 隋書卷004 帝紀大業13年5月

Place: 太原