Roman Empire Standards
Roman Empire Standards were used in place of a national flag. Vexiloids and vexillums were used throughout the Empire. 

Among the empire's many vexiloids, the most known was a red banner with the letters SPQR in Gold surrounded by a gold wreath hung on a military standard topped by a Roman eagle ("aquila") or an image of the goddess Victoria.
Q3246542
Vexiloids
Concept
Q264655
vexillum
Concept
Q3142
red
Concept
Q131306
SPQR
MEDIA
Q208045
Gold
Concept
Q2912707
military standard
Concept
Q3532405
Roman eagle
Concept
Q205985
goddess
Concept
Q308902
Victoria
MISC
Q96402473
Roman Empire Standards
UNK
instance of