Ṣadr ad-Dīn Muḥammad Shīrāzī, also called Mulla Sadrā (; also spelled Molla Sadra, Mollasadra or Sadr-ol-Mote'allehin; ) (c. 1571/2 – 1640), a Iranian Shia Islamic philosopher, theologian and ‘Ālim who led the Iranian cultural renaissance in the 17th century. According to Oliver Leaman, Mulla Sadra is arguably the single most important and influential philosopher in the Muslim world in the last four hundred years.