Daylam

{{Short description|Historical mountainous region of northern Iran}}

File:Nature of Deylaman.jpg

Daylam ({{langx|fa|دیلم}}), also known in the plural form Daylaman ({{lang|fa|دیلمان}}) (and variants such as Dailam, Deylam, and Deilam), was the name of a mountainous region of inland Gilan, Iran.{{Cite book|url=https://books.google.com/books?id=hvx9jq_2L3EC&q=daylam&pg=PA198|title=The Cambridge History of Iran|last1=Frye|first1=Richard Nelson|last2=Fisher|first2=William Bayne|last3=Madelung|first3=W.|date=1975-06-26|publisher=Cambridge University Press|isbn=9780521200936|language=en}}{{Cite book|url=https://books.google.com/books?id=hvx9jq_2L3EC&q=the+cambridge+history+of+iran+4|title=The Cambridge History of Iran|last1=Frye|first1=Richard Nelson|last2=Fisher|first2=William Bayne|last3=Bosworth|first3=C. E.|date=1975-06-26|publisher=Cambridge University Press|isbn=9780521200936|language=en}}{{Cite web|url=http://www.iranicaonline.org/articles/buyids|title=BUYIDS - Encyclopaedia Iranica, Vol. IV, Fasc. 6|last=Tilman|first=Nagel|date=1990|website=www.iranicaonline.org|publisher=Routledge & Kegan Paul|location=London u.a.|pages=578–586|language=en|access-date=2017-03-04}}{{Cite book|url=https://books.google.com/books?id=arELc_R1orcC&q=The+Buwayhid+Dynasty+in+Iraq+334H/945+to+403H/1012:+Shaping+Institutions+for+the+future|title=The Buwayhid Dynasty in Iraq 334h., 945 to 403h., 1012: Shaping Institutions for the Future|last=Donohue|first=John J.|date=2003-01-01|publisher=BRILL|isbn=9004128603|language=en|access-date=3 February 2014}}{{Cite book |last=Kabir |first=Mafizullah |url=https://books.google.com/books?id=I_9tAAAAMAAJ&q=The+Buwayhid+dynasty+of+Baghdad,+334/946-447/1055 |title=The Buwayhid Dynasty of Baghdad, 334/946-447/1055 |date=1964-01-01 |publisher=Iran Society |language=en |author-link=Mafizullah Kabir |access-date=3 February 2014}} It was so named for its inhabitants, known as the Daylamites.{{Cite web|url=http://www.iranicaonline.org/articles/deylamites#pt2|title=DEYLAMITES – Encyclopaedia Iranica, Vol. BII, Fasc. 4|last=Wilferd Madelung|first=Wolfgang Felix|date=1995|website=www.iranicaonline.org|pages=342–347|language=en|access-date=2017-03-04}}

The Church of the East established a metropolitan diocese for Daylam and Gilan around 790 under Shubhalishoʿ.{{citation |author=David Wilmshurst |title=The Martyred Church: A History of the Church of the East |publisher=East and West Publishing |year=2011}}, p. 166.