@Bobby For the record, I think this great that Constantin loved Serdica.  It also just strikes me as such a funny fact to toss into the video. This said, it sets a great precedence for me--I mean I am following in great footsteps.  At the same time, the fact that  Constantin the Great was in love with Serdica also seems like something that would be equally at home on a tourist tee-shirt with a picture of Constantin's face and the caption: He loved Serdica & I love Sofia.