Byzantine helmet typology/evidence?

[Lamellars]

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photo nr 1 - byzantine kettle hat from Russia dating XIII-XIV
photo nr 2 - Dobrich XII-XIV
photo nr 3 - Veliko Tarnovo (dating XII-XIV)
photo nr 4 - Piernik dating XII-XIII
photo nr 5 - Assenova XII-XIV
photo nr 6 - from near Kiev dating about XI-XII or XI-XIII
photo nr 7 - from Hrusica XII-XIII

and I add image Fatimid helmet