Somewhat vague/poorly translated piece from the SNA:
A Bulgarian archeologist has discovered in central Bulgaria a script about Roman Emperor Galien, it was announced Sunday.
The writing was found at the Sostra site, which was the predecessor town of Today's Troyan, in central Bulgaria.
According to the inscription, Emperor Galien (ruled over 253-268) has led a legion to Sostra.
That proves Roman efforts to keep the lands of today's Bulgaria from the Goths, archeologists believe.