Sibt al-Maridini's classical commentary on 'Fara'id', the metrical treatise of al-Rahbi (d. 579/1183) on the rules of inheritance. Sibt al-Maridini (826/1423-912/1506, Egypt, full name: Muhammad ibn Muhammad ibn Ahmad ibn Muhammad ibn al-Ghazal) was a astronomer and mathematician, and wrote many works on Islamic law, astronomy, and mathematics.