There isn't a lot of information on the Daylamis from the Elburz mountains south of the Caspian Sea. To start with, here are extracts from a doctoral thesis The military technology of classical Islam, concerning Daylamis, by David Nicolle.
plus the pictorial sources referred to including:
Manuscript, 'Joshua' Rabula Gospels, 586 AD, north Syrian, Bib. Laur. Plut. 1, f.4r, Florence
Fatimid Manuscript with two soldiers, 11th - 12th Centuries, Museum of Islamic Art, Cairo
Paper fragment, 11th-12th centuries AD, Fatimid, Museum of Islamic Art no. 12801, Cairo
Byzantine Plates - Herakleios, early 7th century, with scenes from the life of David, Metropolitan Museum, New York
Manuscript from Mosul, Kitab al Diryak, mid-13th century AD, Nationalbibliothek, Ms. AF. 10, Vienna
Manuscript, 13th century AD, Syriac Jazirah, Bib. Vat., Ms. Syr. 559, Rome
Ceramic fragment, 10th-11th centuries AD, Fatimid, Victoria and Albert Museum, London
Manuscript, Book of Fixed Stars, 1009 AD, western Iranian or Iraq, Bodleian Lib., Ms. Marsh 144, Oxford
Druzhina
Illustrations of Costume & Soldiers
plus the pictorial sources referred to including:
Manuscript, 'Joshua' Rabula Gospels, 586 AD, north Syrian, Bib. Laur. Plut. 1, f.4r, Florence
Fatimid Manuscript with two soldiers, 11th - 12th Centuries, Museum of Islamic Art, Cairo
Paper fragment, 11th-12th centuries AD, Fatimid, Museum of Islamic Art no. 12801, Cairo
Byzantine Plates - Herakleios, early 7th century, with scenes from the life of David, Metropolitan Museum, New York
Manuscript from Mosul, Kitab al Diryak, mid-13th century AD, Nationalbibliothek, Ms. AF. 10, Vienna
Manuscript, 13th century AD, Syriac Jazirah, Bib. Vat., Ms. Syr. 559, Rome
Ceramic fragment, 10th-11th centuries AD, Fatimid, Victoria and Albert Museum, London
Manuscript, Book of Fixed Stars, 1009 AD, western Iranian or Iraq, Bodleian Lib., Ms. Marsh 144, Oxford
Druzhina
Illustrations of Costume & Soldiers