Liberation of Constantinople (Premysloides Dynasty)

Background
After so-called "Nicean Coup", when pseudo-Premysl was toppled by trueborn Premysl and when trueborn Premysl ordered massive purge against agents and servants of Latin Empire, all hopes in fall of Nicean Empire vanished. However, no one could imagine triumphal victorious campaign which Premysl Premysloides decided to start.

However, before he can restore Byzantine Empire to former glory, he needed at least liberate Constantinople from Crusader and Venetians hands. Fall of Eusebios and Jean Argyros and their provincial power over Ahtopol, led to collapse of last crusader stronghold out of Constantinople.