Brill Encyclopedia of Early Christianity Online

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Addai was a Christian apostle who, according to tradition, in the 1st century CE evangelized the city of Edessa and the region of Osrhoene in northern Mesopotamia. His name seems to be the Syriac form of Greek Θαδδαῖος and Latin Thaddaeus. His legend is related to that of the purported conversion of King Abgar Ukkama (“the Black”) of Edessa to Christianity. I. Ramelli (2015) investigates how the superimposition of different religious discourses and agendas over the centuries shaped the complex …

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Ramelli, Ilaria L.E., “Addai”, in: Brill Encyclopedia of Early Christianity Online, General Editor David G. Hunter, Paul J.J. van Geest, Bert Jan Lietaert Peerbolte. Consulted online on 27 September 2023 <>
First published online: 2018

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