Mar Dadishoʿ I was a Catholicus of the Church of the East from 421 AD to 456 AD
Significantly, in his reign, in 424 AD, the Church of the East declared itself independent of all other churches; Catholicus Mar Dadisho I started carrying the title of Patrairch as well.
Thereafter, all the Catholicoi, heads of the Church of the East started carrying besides the title of Catholicus, the additional title of Patriarch, Mar Dadisho being the first Catholicus-Patriarch himself.
- Wigram, W. A. (2004). An introduction to the history of the Assyrian Church, or, The Church of the Sassanid Persian Empire, 100–640 A.D. Gorgias Press. ISBN 1-59333-103-7.
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