Well I think that's probably a Turkish helmet, not a Persian helmet. (Though the Turks have by now become lords of Persia, so that is sort of a moot point... nonetheless the helmet was probably looted from a dead Ayyubid soldier, rather than a Seljuk, considering they weren't truly in conflict with Jerusalem at the time of the Leper King, so it's probably from an unfortunate Turkish noble or freeman that came along with Saladin [who was Kurdish, and therefore from or modern day Iraq, and who also served the Turkish Sultan for a time]. Either that or a slightly inaccurate prop in the movie, which is my personal actual guess.)
AAAAANYWAYS, I'm looking forward to the update, especially with the promise of new characters, who look quite interesting. Been a long time since we've seen a Vatazces like the one who saved Basil, hopefully one of them is as amusing as that foul-mouthed pile of awesomeness.