Ultramarines are the most obviously Greek SM legion-chapter.
Some people have pointed out that they are Roman-like, but seeing as how Rome and Greece form the Greco-Roman culture - because of Greece's tremendous influence on Rome - exclusively Roman elements must be those that deviate from the classical ideals; bureaucracy, grandiosity and sensationalism.
As such, the most Roman legion are the Emperor's Children, not the Ultramarines.
UM' symbol is the inverted Omega while EC - and only EC - have the aquila.
UM' most holy place the temple of Hera.
UM' color is ultramarine (blue), the color of Greece, symbolizing the sea, the Greek's true home and moneymaker. EC on the other hand favor the imperial purple.
UM' great library was built by their first librarian, Ptolemy, a reference to the library of Alexandria.
UM wear chitons whereas EC favor the Roman toga.
UM' character names are almost exclusively Greek (or made up obviously), whereas EC names cover almost all Roman Emperor names.
- Note though that Greek (and Roman) names are in every faction of the Imperium.
UM also have a ton of subtle Greek references that someone can easily miss; e.g. the protagonist of the Ultramarines Omnibus, Ventris, is named after the archaeologist who decrypted linear B.
In any case, if Greco-Roman fits into your Greek notion, then most loyalist SM and the Imperium itself are the Greco-Romans.
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