What is the name of the monk who evangelized Salman al-Farsi about the prophethood of Prophet Muhammad, peace and blessings be upon him, and how did the monk know of his prophethood and his name?

The name of the monk whom Salman al-Farisi (may Allah be pleased with him) met is not mentioned in the narrations we have consulted; he became known as "the Companion of Ammuriya." This monk described to Salman the characteristics of the Prophet Ahmad and the place of his advent. Some weak or denounced narrations contain additional details. However, the authentic and reliable account of Salman's conversion to Islam is the narration by Ibn Ishaq from Asim ibn Umar ibn Qatadah al-Ansari, from Mahmoud ibn Labid, from Abdullah ibn Abbas. Monks knew about the imminent advent of the Prophet (peace be upon him) and his description from earlier scriptures like the Torah and the Gospel, which contained mention and description of the Prophet (peace be upon him).