The form of the Phrygian helmets didn’t dosappear in ages.
After Antient times similar type helmet domes were in use by Romans. Then they appear again at least in the 9th sentury in Byzantine epoch.
Then during the 11th century this helmet was outspread in Italy, Spain and then futher and futher to Western Europe and Rus.
We have just reconstructed the look of any helmet with the mask and used the lamellar aventail also.
Check it out!