Thracian nobleman, top 2nd from right. Has lots of Greek lookng armour with the addition of a groin protector at the bottom of the cuirass, he wears greaves, which were out of fashion in Greece and has a crecent shaped shield. 3rd from the left/top row, is a Scythian horse archer. Middle: left, two Dacian/Thracian noble men, 3rd from left/mid Roman Imperial legionary, bottom left; a Roman cavalryman with a "parade" face mask helmet.
5th/6th c. BC Greek hoplites - only ever seen the helmet with the transverse comb on representations of Spartan leaders. These could be Spartans as at that time Greek warriors used whatever symbol, on their shield, that they wanted.
The Spartan hoplite. A hoplite was a heavy armed warrior. A Spartan soldier generally carried a dory (spear), xiphos (Spartan sword), hoplon (shield), a Corinthian helmet, greaves (shinguards), and a metal or lamellar cuirass. The Spartan weapons were a well honed part of the ancient world’s premier war machine. Sparta’s elite warriors trained from a young age and unlike their contemporaries on the battle field, being a warrior was the only career they would ever know.