The Ketchaoua Mosque is a mosque in Algiers, the capital of Algeria. It is located at the foot of the Casbah, which was built during the Ottoman rule in the 17th century, which is a UNESCO World Heritage Site. The mosque that stands on the first of the Casbah’s many steep stairways, was logistically and symbolically the cynosure of the pre-colonial city of Algiers. The mosque is noted for its unique fusion of Moorish and Byzantine architecture.
The mosque was originally built in 1612. Later, in 1845, it was converted during French rule, to the Cathedral of St Philippe, which remained so until 1962. It was reconverted into a mosque in 1962. In spite of these transitions over two different religious faiths in the last about four centuries, the mosque has retained its original grandeur and is one of the major attractions of Algiers.