Both of these coins have an Emperor riding a horse on the reverse, beside an Antioch mint mark and " Gloria Romanorum ". The obverse shows Emperor Arcadius who is considered as scarce by RIC in this series . However, the coin to the left representing Emperor Honorius does not seem to figure primarily on the list for that series. Anyway, I would like to read all your dear comments..LOL...
It isn't as common a type as others, for both Arcadius and Honorius, but I think they're about the same. I see just as many of them from Honorius as Arcadius. They may be listed as scarce in RIC, but they're not hard to find.