Galla Placidia, AE4, Rome mint.

DN GALLA PLA-CIDIA PF AVG, Female, pearl-diademed bust 
right, wearing necklace and earrings.
SALVS REI-PVBLICE around plain cross, T in left field.
Mintmark RM.

RIC X 2111.
Very rare, rated R4.

Image courtesy of Eugene Paunov.