This document provides details of interactions between the Prophet Muhammad and the Byzantine Emperor Heraclius. It describes how Heraclius had a vision foretelling the coming of a prophet among those who were circumcised. When Abu Sufyan's trading caravan arrived from Mecca, Heraclius summoned them and questioned Abu Sufyan about Muhammad and Islam. Satisfied that Muhammad was a true prophet, Heraclius declared that if he was able to meet Muhammad, he would not mind hardship to do so and would wash his feet. However, Heraclius kept his true beliefs private due to opposition from generals and church patriarchs.