Daylam

Nature of Deylaman
The historical region of Dailam on the Caspian Sea. The present-day Iranian provinces of Gilan (left) and Mazandaran (right) are highlighted in color.

Daylam (Persian: دیلم), 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.

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