Daylam (), also known in the plural form Daylaman (دیلمان) (and variants such as Dailam, Deylam, and Deilam), was the name of a mountainous region of inland Gilan, Iran. It was so named for its inhabitants, known as the Daylamites.
The Church of the East established a metropolitan diocese for Daylam and Gilan around 790 under Shubhalisho., p. 166.
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