Leiyang is a county-level city in Hengyang, Hunan in China. It has over 1.3 million inhabitants. Cai Lun, the traditionally credited inventor of paper, was born and lived in Leiyang. Now, there is a Cai Lun invention square established in Leiyang to show a respect for Cai Lun.
Contributions by EdisonChen, Neo-Jay, and Stevenmitchell.