Yìdū
Yidu was the county seat of Qingzhou in central Shandong, a city with a long history as an administrative and commercial centre. East of its walls, the Zhaode quarter housed a Muslim community and the Zhenjiao Mosque. The mosque was rebuilt under the Yuan by descendants of Sayyid Ajall Shams al-Din, repaired by local officials in the Ming and enlarged again under the Qing. Its halls and courtyards stand as a reminder of the community's lasting place in the city.