从历史地理学角度看"玄武门之变"

唐代长安宫城北门玄武门是朝臣入宫奏事的必经之地，因此，玄武门成为宫中与外朝联系的咽喉要地。秦王李世民与皇太子李建成的权力争夺最终导致“玄武门之变”的发生，六月四日当日的对质，玄武门是李建成、李元吉入宫的必经之地，所以在政变中把玄武门作为埋藏伏兵突袭的有效地点，切断建成、元吉的退路是必然的。同时，李世民依靠收买的北门禁军重要将领，采用先发制人的战略，最终获得“玄武门之变”的成功。

Xuanwu Gate and Xuan Wu Men coup

As the only way for the courtiers to present their memorials to the throne in the imperial court, Xuanwu Gate functioned as a vital passage to connect the imperial palace with the outside world in Tang Dynasty. The fight for power between Emperor Li shi - min and Princess Li Jian - cheng finally led to the Xuan Wu Men coup. Because of the important position Xuanwu Gate holds, naturally, Li Shi - min chose it as an effective place to give his rebelling son a surprise attack, cutting off his retreat. And by bribing the generals of the royal troops in North gate, Emperor Li took preemptive measures and finally defeated the rebelling force.