Three Schoolfellows
The medieval tale of the Three Schoolfellows (Persian: سه یار دبستانی) narrates how the vizier Nizam al-Mulk, the Nizari revolutionary Hasan-i Sabbah, and the mathematician-poet Omar Khayyam made a success-sharing pact when they were classmates in their youth, eventually leading to the assassination of the vizier by Hasan's followers, while the third was no longer interested in power. The tale which is recorded in multiple classical Persian sources is considered as folklore by most modern scholars, but some have argued that it is inspired by real events.