Boris Maslow saw clear signs that it went through two different periods of construction, but no dates are indicated by scholars other than the assumption that it was built some time after the nearby Al-Hamra Mosque (14th century).[3]:120[4]:101 The Mzellja Mosque, located in the Douh neighbourhood (western Fes el-Bali), originally dates from the Marinid period and features an elegant decorative panel of square Kufic script above its street entrance.[46] The Derb esh-Sheikh (or Derb ech-Cheikh) Mosque, located just northeast of the Hammam al-Mokhfiya in the el-Gzira neighbourhood, has a minaret with a broad darj-wa-ktaf moftif carved in brick on its southern and eastern facades (the sides facing the street) while its northern and western facades have been left blank.