Handan was the Warring States capital of
赵 (Zhao) from 386 BCE. It is the 'hometown of chengyu' — reportedly the birthplace of 1,500+ idioms, including
邯郸学步 ('learning to walk in Handan' — a Yan youth imitates Handan's graceful stride, forgets his own gait, and crawls home),
完璧归赵,
负荆请罪,
纸上谈兵.