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Zarhun is the city of Mawlay Idris I (d. 157 H.). The Idrisis are scions of the Prophet (s) who settled in Morocco and nearby areas. They are from the progeny of Imam al-Hasan b. ‘Ali b. Abu Talib, may Allah have mercy on both of them.
From wiki:
Moulay Idriss Zerhoun (Arabic: مولاي إدريس) is a town in northern Morocco. It is spread over two hills at the base of Mount Zerhoun, the town of Moulay Idriss. It was here that Moulay Idriss I arrived in 789, bringing with him the religion of Islam, and starting a new dynasty. In addition to founding the town named after him, he also initiated construction of Fez, continued later by his son, Moulay Idriss II.
Just off the main square is the Mausoleum of Idriss I.
Also of note is the round minaret at another mosque in town, the only one in Morocco.
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