Dihyah al-Kalbi (Fidem Pacis)

Dihyah ibn Khalifa Wahi al-Kalbi was an Arab companion of the Prophet Muhammad. Though prominent in Arabia as the leader of a large clan, his chief claim to fame is as an ambassador from Muhammad to the Roman emperor, Heraclius.

In 630 Dihyah was sent to Roman territory with a message for the emperor. Journeying via Charax and Antioch, he arrived at Constantinople in October and immediately sought an audience with Heraclius. The latter, having been forewarned by Cyrus of Alexandria and by his own spies in Arabia, was already aware of the new political and religious situation and was eager to discuss it with Dihyah.