Changhua, officially known as Changhua City (Chinese: 彰化市; pinyin: Zhānghuà Shì; Wade–Giles: Chang-hua Shih; Pe̍h-ōe-jī: Chiong-hòa-chhī/Chiang-hòa-chhī), is a county-controlled city and the county seat of Changhua County in Taiwan. For many centuries the site was home to a settlement of Babuza people, a coastal tribe of Taiwanese aborigines. Changhua city is ranked first by population among county-controlled cities. Historically, Changhua city was a base for the Hans when they invaded Taiwan and to defend from the Taiwanese aborigines, a fortress built out of bamboo was made.