Asilah is a fortified town on the northwest tip of the Atlantic coast of Morocco, about 31 km (19 mi) south of Tangier. Its ramparts and gateworks remain fully intact.

The Idrisid dynasty or Idrisids were an Arab Muslim dynasty from 788 to 974, ruling most of present-day Morocco and parts of present-day western Algeria. Named after the founder, Idris I, the Idrisids were an Alid dynasty descended from Muhammad through his grandson Hasan. The Idrisids are traditionally considered to be the founders of the first Moroccan state, setting the stage for subsequent dynasties and states centered in this region. Their reign played an important role in the early Islamization of Morocco and also presided over an increase in Arab immigration and Arabization in major urban centers.