Well I would think that Persians/Iranians would be pissed at the way the Immortals are shown in the movie.
I found the article on them in wikipedia
The
Persian Immortals were the
Persian elite
Imperial Guard regiment during the
Greco-Persian Wars.
The term
Immortals comes from
Herodotus who called them either
Ten Thousand or
Athanatoi (lit.
immortals). Persians themselves probably did not use the term Herodotus may have used a corruption of a Persian word
anusiya (= "companions").
Herodotus tells that Immortals were heavy
infantry lead by
Hydarnes that was kept constantly in strength of exactly 10,000 men every killed, seriously wounded or sick member was immediately replaced with a new one, maintaining the cohesion of the unit.
The regiment accepted only Median or Persian applicants.
Their weapons were a leather and wicker
shield, a short
spear with an iron point and a counterbalance on the other end, a
bow with cane arrows, a quiver for them and a
dagger or short
sword. The regiment's uniform consisted of a
tiara or soft felt cap, an embroidered long-sleeved
tunic, trousers, and a coat of metal. Their usual tactics involved a front rank charge at the enemy while the rear ranks shot arrows to support the assault.