The town of Amul at the time was known to be heavily populated by Shi’ite Muslims. At a very young age he started studying Imam Shi’ism and attended the juridical school of madhhab where he also devoted his time to Sufism, until around the age of thirty.Haydar Amuli first began his studies in his home town of Amul. He eventually moved on to the town of Astarabad, located near Mazandaran, and then Isfahan, located in the centre of Iran.In his early twenties, Sayyid Haydar Amuli returned to Amul and became a trusted confidant and eventually a special deputy and chamberlain to the Bavandid Hasan II, who was the ruler of Tabaristan. Even though Amuli had a close relationship with Hasan II, he experienced a religious crisis. Amuli quotes in his work Inner Secrets of the Path that he started to feel that he was corrupt and that he needed to move to a place where he could fully devote himself to God. So Haydar Amuli gave up his position in the court to further pursue Sufism. He abandined the courtly life, a couple of years before Hasan II was assassinated by members of his own family.
After Haydar Amuli’s departure from the court, he began practicing Sufism. Living in the village of Tihran, he began to follow a shaykh by the name of Nur al-Din Tihrani, a gnositc and ascetic of Allah. Amuli spent a little less than a month in his company before going on to wear the symbolic Sufi cloak or khirqa.Eventually, Haydar Amuli went on to embark on a pilgrimage or Hajj, going on to visit various Shi’ite shrines and also traveling to Jerusalem as well as the holy cities of Mecca and Medina. Unfortunately, due to ill health, Amuli had to leave Medina .It is documented that he spent the rest of his life in Iraq. For several years he studied in Baghdad amongst important Shi’ite scholars including Fakhr al-Din Muhammad al-Hasan and Nasir al-Din al-Kashani al-Hilli. These two scholars were prominent figures in Shi’ism at the time. Haydar al-Amuli then settled in the Shi’ite city of Najaf, south of Baghdad, for over thirty years until around 1385 CE, the year he was last documented to be living. This is also around the same time that he completed his last work, called Resalat al-olum al-aliya.