Murtadha al-Ansari

Murtadha al-Ansari al-Tostari
مرتضی الأنصاري التستري
TitleGrand Ayatollah
Personal life
Born1781
Died1864 (aged 82–83)
Resting placeImam Ali Shrine
Other namesSahib al-Makasib, Arabic: صاحب المكاسب
Sheikh al-Ta'ifa, Arabic: شيخ الطائفة
Relatives Jabir ibn Abd Allah al-Ansari (ancestor)
Religious life
ReligionIslam
DenominationTwelver Shi'a
InstituteNajaf Seminary
JurisprudenceJa'fari
CreedUsuli
Muslim leader
Based inNajaf, Iraq
PostGrand Ayatollah
Period in office1849–1864
PredecessorMuhammad Hasan al-Najafi
SuccessorMirza Shirazi

Grand Ayatollah Sheikh Murtadha al-Ansari al-Tostari, also Morteza Ansari Shushtari (1781–1864; Arabic: مرتضی الأنصاري التستري; Persian: مرتضی انصاری شوشتری), known as Shaykh al-Ta'ifah (Arabic: شيخ الطائفة, romanizedShaykh al-Ṭāʾifah; Persian: شیخ الطائفه) was a Shia Islamic scholar who was “generally acknowledged as the most eminent jurist of the time". He is considered to have laid the foundation of modern Shi'i jurisprudence, and his style has been imitated more than any other classical scholar of Shia Islam. Ansari is considered the "first effective" model or Marja of the Shia or "the first scholar universally recognized as supreme authority in matters of Shi'i law".

In Iraq, al-Ansari is referred to with the honorific Ustād al-Fuqahā wa al-Muhaqiqīn.