Foundations of the Sunnah (Usool-us-Sunnah)

Imam Ahmad ibn Hanbal considered the founder of the Hanbali school of fiqh . Imam Ahmad is one of the most celebrated Sunni theologians, often referred to as "Sheikh ul-Islam"[8] or the "Imam of Ahl al-Sunnah. Source: Internet Archive · FoundationsOfTheSunnahusool-us-sunnah