Time Has Disappeared Into An Unknown Evil

Foreword:

The year of 1462 a time of feudal crisis
Years of plague and epidemic, following the wars.
Long-lasting conflicts provoked by Turkish raids.
Fights for the crown and disputes between great kingdoms.
Weakened and exhausted the whole continent ... earth soaking with blood.
Every land has it's own Count and every Count has his own interests.
What cause could possibly unite so many
quarrelling enemies under one flag?