But he was very cautious in the ongoing conflict between the provincial metropolitans and the Patriarchate .
He was also prominent in the fight against doctrinal heresy , for instance Nicholas condemned as heretical the Bogomil leader Basil the Physician .
Nicholas was very cautious in the ongoing conflict between the provincial metropolitans and the Patriarchate .
He was also prominent in the fight against doctrinal heresy , for instance Nicholas condemned as heretical the Bogomil leader Basil the Physician .