Áqá Muḥammad-i-Qá'iní (also known as Fadil-i-Qa'ini ("Learned One of Qa'ín") and surnamed Nabíl-i-Akbar (Arabic: نبيل الأكبر); 1829–1892) was a distinguished Baháʼí from the town of Qá'in.
ʻAbdu'l-Bahá recounted: :There was, in the city of Najaf, among the disciples of the widely known mujtahid, Shaykh Murtada, a man without likeness or peer.
This teacher was the same Shaykh who refused to associate himself with the Shiʻi divines gathered together to concert plans against Baháʼu'lláh during his time in Baghdad.
As far as the accomplishment demanded of a Shiʻih mujtahid is concerned, his attainment was superb, but naturally he had little knowledge of the lore and the scholarship of the West.
Mírzá Abu'l-Faḍl of Gulpáygán, on the other hand, was well versed in Islamic studies and had a wide and comprehensive knowledge of Western thought as well.