There are mosques all over the medina; interiors are off-limits to non-Muslims. The finest include Mosque of Sidi Mahres, built in 1692 and named after Tunis' patron saint, who saved the city after it was captured by Abu Yazd during a rebellion against Fatimid rule in AD 944. He also allowed Jews to settle within the walls, and reorganised the souqs. His tomb lies opposite the entrance, in the Zaouia of Sidi Mahres.
The mosque is ranked as one of the city's finest Ottoman buildings, with a cluster of white domes resembling a heap of eggs. But there's something missing. It's the minaret - never added as the project ran into difficulties following 17th-century political upheaval. Women come here to pray to be endowed with a husband or children. The surrounding busy local souqs are an interesting place for a wander and for picking up cheap pottery.