sentences:  Nikola Obretenov was born on 28 May 1849 in Ruse, the administrative centre of Danube Province, Ottoman Empire, in the family of Tiho Obretenov — a wealthy and educated Bulgarian of that time — and Tonka Obretenova.In January 1863, being a student in a local school, Nikola Obretenov took part in the expulsion of the Greek bishop Sinesiy.Next year he graduated, and in the autumn he went to his father in the village of Sakcha in Northern Dobruja (modern Romania).