Isaac II Angelus , in order to raise Earnings_and_losses money for his wedding Forming_relationships with the daughter of King Béla III of Hungary , levied Imposing_obligation a new tax which fell heavily on the population of the Haemus Mountains .

They asked Request to be added Cause_to_be_included to the roll of the Byzantine army and to be granted Giving land near Haemus to provide Supply the monetary income needed to pay Cost the tax .

The lands between the Haemus and the Danube were now lost Earnings_and_losses for the Byzantine Empire , leading to Causation the signing of a truce , thus de facto recognising Know the rule of the Asen and Peter over the territory , leading to Causation the creation of the Second Bulgarian Empire .