Fazl ibn Shazan was one of the fellows of Imam Reza (PBUH). He has written 180 books on defending the Shia' privacy one of which is the book of "al-Ghaybah" about Imam Zaman (PBUH). Tomb of Fazl ibn Shazan is located in Nishapur next to Behesht-e Fazl. Behesht-e Fazl is the major cemetery of Nishapur that is called after being adjacent to tomb of Fazl ibn Shazan.