Who was the sahabi speech at hirkal emperor?

The Sahabi who delivered a speech at the court of the Byzantine Emperor Heraclius was Abu Sufyan ibn Harb, a prominent companion of the Prophet Muhammad. He was sent as an emissary during the early Islamic conquests to convey the message of Islam and challenge the emperor's authority. In his speech, he emphasized the strength and unity of the Muslims, highlighting the significance of the Islamic message and the inevitability of its spread. This encounter underscored the growing influence of Islam during that period.