明建文二年(1400年),燕王朱棣自海津镇渡大运河南下,开启“靖难之旅”。朱棣夺帝位后,为纪念由此起兵,于永乐二年(1404年)十一月二十一日赐地名天津,即“天子经过的渡口”之意。自此,天津开始筑城设卫,并成为中国古代唯一有确切建城时间记录的城市。也就是从那时起,天津开始了一座城池的兴衰荣辱与峥嵘岁月。 Ming Jianwen two years (1400 years), Yan Wang Zhu Di crossing the Grand Canal from Hojin Town south, open “Jing difficult trip ”. After Zhu Di won the throne, in order to commemorate the army thus started, Yu Yongle two years (November 14, 1404) gave the place name of Tianjin, that is, “the ferry passed by the emperor”. Since then, Tianjin began to build a city, and became the only city in ancient China that recorded the exact time of its construction. That is, since then, Tianjin has started a prosperous city, the rise and fall of honor and glory days.