In Morocco by Edith Wharton — Read

It is usual to speak of Fez as very old, and the term seems justified when one remembers that the palace of Bou-Jeloud stands on the site of an Almoravid Kasbah of the eleventh century, that when that Kasbah was erected Fez Elbali had already existed for three hundred years, that El Kairouiyin is the contemporary of Sant' Ambrogio of Milan, and that the original mosque of Moulay Idriss II was built over his grave in the eighth century.

Fez is, in fact, the oldest city in Morocco without a Phenician or a Roman past, and has preserved more traces than any other of its architectural flowering-time, yet it would be truer to say of it, as of all Moroccan cities, that it has no age, since its seemingly immutable shape is forever crumbling and being renewed on the old lines.