Ivan II (Иван II, also Йоан II,
Ioan II, ), known as
Kaloyan the Greek-slayer or alternatively as
the Roman-slayer , ruled as emperor (
tsar) of
Bulgaria between 1197 and 1207. He is the third and youngest of the brothers who managed to restore the Bulgarian Empire, the others being
Peter IV and
Ivan Asen I. Kaloyan managed to stabilize the tsar's power and the
Second Bulgarian Empire's position as a leading power in
Southeastern Europe thanks to his successful campaigns against the
Latin Empire.