He like other giants of the Salaf were of Persian descend. Hasan Al-Basri, the great Tabi’i (رحمه الله) was brought up in the house of Umm Salamah (رضي الله عنها), he is one of the major (in fact many scholars call him the CHIEF of the Tabi’in) Tabi’in, well known for his wisdom.
The father of al-Hasan was a Persian who lived in Madinah but was originally from Maysan (today located in south-east Iraq, close to the Iranian border). His father and his mother were clients and servants of the Mother of the Believers Umm Salamah. Umm Salamah who used to take al-Hasan al-Basri to the learning circles of the Sahaba and Umar Ibn al-Khattab once made a Du’a of al-Hasan, asking Allah to give al-Hasan the proper understanding of the Din and to (al-Hasan) and the love of the people (i.e. being loved by the people). Abu Ishaq al-Firuzabadi al-Shirazi (a great Sunni Persian Shafi’i scholar from the pre-Safavid FORTRESS of the Ahl Al-Sunnah and Shafi’iyyah i.e. the ancient city of Shiraz in Persia) reported in his ‘al-Tabaqaat’ (a whole book dealing with the mostly Shafi’i scholars of Persia back in his time!) that the person who resembled Umar Ibn al-Khattab most was al-Hasan al-Basri.