sentences:  Nikola Obretenov
  
  Nikola Tihov Obretenov (28 May 1849 – 11 October 1939) was a Bulgarian revolutionary, one of the combatants for the liberation of Bulgaria, and a participant in the Stara Zagora Uprising and the April Uprising.His book "Memories About Bulgarian Uprisings" was published posthumously and is a primary source of historical information about those events.