Dhia' ul-Dīn 'Abd al-Malik ibn Yūsuf al-Juwaynī al-Shafi'ī (Persian: امام الحرمین ضیاءالدین عبدالملک ابن یوسف جوینی شافعی, 17 February 1028 – 20 August 1085; 419–478 AH) was a Persian Sunni scholar famous for being the foremost leading jurisconsult, legal theoretician and Islamic theologian of his time. His name is commonly abbreviated as al-Juwayni; he is also commonly referred to as Imam al-Haramayn meaning "leading master of the two holy cities", that is, Mecca and Medina. He acquired the status of a mujtahid in the field of fiqh and usul al-fiqh. Highly celebrated as one of the most important and influential thinkers in the Shafi'i school of orthodox Sunni jurisprudence, he was considered as the virtual second founder of the Shafi'i school, after its first founder Imam al-Shafi'i. He was also considered a major figurehead within the Ash'ari school of theology where he was ranked equal to the founder, Imam al-Ash'ari. He was given the honorific titles of Shaykh of Islam, The Glory of Islam, The Absolute Imam of all Imams. Source: Wikipedia (en)