The Hanafi school or Hanafism is one of the four major schools of Islamic jurisprudence within Sunni Islam. It developed from the teachings of the jurist and theologian Abu Hanifa (c. 699–767 CE), who systemised the use of reasoning (ra'y). Hanafi legal theory primarily derives law from the Quran, the sayings and practices of Muhammad (sunnah), scholarly consensus (ijma) and analogical reasoning (qiyas), but also considers juristic discretion (istihsan) and local customs (urf).