Imam Ahmad ibn Hanbal is remembered for many things. He was an Imam in Fiqh, Hadith, and many other sciences. In fact, his madh-hab is one of the four established madh-habs of Ahl as-Sunnah wal-Jama’ah.
Yet, the one matter he is most remembered for… one of the most defining moments in the History of Ahl as-Sunnah wal-Jama’ah… is his stance in the time of the Mihnah (the Inquisition).