Updated: Aug 25, 2018
As Bulgaria wrestles with the prospect of civil war, a new Empire emerges. In this episode, the entire region is remade.
Below is a map of Bulgaria under the rule of Konstantine Tih, a more general map of the region during this period, a fresco painting of Konstantine Tih from the Boyana Church, and a recreation of the golden seal of Konstantine Tih stating "Konstantin, in Christ the God, a faithful tsar and autocrat of the Bulgarians, Asen."
For more context about what the Mongols were up to East of the Byzantine Empire during this period, here's a short Youtube Documentary from Kings and Generals.