Aljafería in the context of Abu Jaffar Al-Muqtadir

A multifoil arch (or polyfoil arch), also known as a cusped arch, polylobed arch, or scalloped arch, is an arch characterized by multiple circular arcs or leaf shapes (called foils, lobes, or cusps) that are cut into its interior profile or intrados. The term foil comes from the old French word for "leaf." A specific number of foils is indicated by a prefix: trefoil (three), quatrefoil (four), cinquefoil (five), sexfoil (six), octofoil (eight). The term multifoil or scalloped is specifically used for arches with more than five foils. The multifoil arch is characteristic of Islamic art and architecture; particularly in the Moorish architecture of al-Andalus (Iberian Peninsula) and North Africa and in Mughal architecture of the Indian subcontinent. Variants of the multifoil arch, such as the trefoil arch, are also common in other architectural traditions such as Gothic architecture. 

In architecture, a foil (from Latin folium 'leaf') is a type of decorative element based on a symmetrical rendering of leaf shapes, defined by overlapping circles of the same diameter that produce a series of cusps to make a lobe. Typically, the number of cusps can be three (trefoil), four (quatrefoil), five (cinquefoil), or a larger number (multifoil).

Foil motifs may be used as part of the heads and tracery of window lights, complete windows themselves, the underside of arches, in heraldry, within panelling, and as part of any decorative or ornamental device. Foil types are commonly found in Gothic and Islamic architecture.

The Banu Hud (Arabic: بنو هود Banū Hūd), also known as the Hudids or the Hudid dynasty, were an Arab dynasty that ruled the taifa of Zaragoza from 1039 until 1110.

The Hudid dynasty descends from Hud ibn Abd Allah ibn Musa ibn Salem al-Judhami (d. ca. 960).