أحمد بن حنبل
In addition, there are several differences within Sunni Islam and Shia Islam. Sunni Islam is separated into four main schools of jurisprudence, namely, Hanafi, Maliki, Shafi'i, Hanbali. These schools are named after Abu Hanifa, Malik ibn Anas, al-Shafi'i, and Ahmad ibn Hanbal, respectively.