15899
It was not until the reign of Pope Leo II ( 682 83 ) that the independence of the See of Ravenna was suppressed :  Emperor   Constantine IV  revoked the edict of Constans and confirmed the ancient rights of the Roman See over the See of Ravenna .
 title of person: Emperor, Constantine IV
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 title of person: Emperor, Constantine IV