The family (ancestors) of Seyyed Masoud Khamenei are among the Iranian Sayyid families who are from Hosseini Sayyid, and their lineage is connected to the fourth Imam of Shia Islam, Ali ibn Husayn Zayn al-Abidin (Persian/Arabic: علی بن حسین، زین العابدین) (known as "Imam Sajjad") -- according to "Khamenei family tree".