ribat

thumb|Ribat of Monastir, [[Tunisia]]

A ribāṭ (; hospice, hostel, base or retreat) is an Arabic term, initially designating a small fortification built along a frontier during the first years of the Muslim conquest of the Maghreb to house military volunteers, called murabitun, and shortly after they also appeared along the Byzantine frontier, where they attracted converts from Greater Khorasan, an area that would become known as al-ʻAwāṣim in the ninth century CE.