Late Roman Ridge Helmet "Intercisa I"

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In the late 3rd century, a complete break in Roman helmet design occurred. Previous Roman helmet types, based ultimately on Celtic designs, were replaced by new forms derived from helmets developed in the Sassanid Empire. A closely related form to the Roman ridge helmets is represented by a single helmet from Dura Europos which is of similar construction, but has a much higher-vaulted skull. It probably belonged to a Sassanid warrior of the 3rd century. This reinforces the evidence for a Sassanid origin of this type of helmet. Two main forms of helmet construction were adopted by the Romans at much the same time: the ridge helmet, described here, and the Spangenhelm, which was likely adopted from the Sarmatians. The earliest confirmed example of a Late Roman ridge helmet is the Richborough helmet, which dates to about 280 AD

Source: https://magister-militum.co.uk/blog/intercisa-helmets