Целият текст можете да погледнете ТУКChristians continued fighting Christians, some lords sought protection by allying themselves with the Turks, agreeing to vassalage. In 1372 the Bulgar tsar of Tirnova, John Sisman, also swore homage to the Ottoman sultan and sent to Murad his daughter as a bride.
Не знам доколко е дискутирано това нещо, ама преди малко един познат ми го прати на ICQ и доста се нервирах..........