A lot of the Western Emperors prior to Theodosius stayed in Trier a lot in original timeline.While would be probable, if would be the imperial political will to do, that ATL Emperor's residence/capital city would be become an intellectual/theological center and those increases its prestige... the mentioned city was too near from the, OTL, imperial borders.
I know, but I was referring, in specific, to the situation in the Roman Empire both OTL or ATL.