▁book ▁" Mem ories ▁About ▁Bulgar ian ▁U pr is ings " ▁was ▁published ▁post hum ously ▁and ▁is ▁a ▁primary ▁source ▁of ▁historical ▁information ▁about ▁those ▁events . ▁ ▁Biography ▁ ▁Early ▁life ▁▁ ▁Nik ola ▁O bre ten ov ▁was ▁born ▁on ▁ 2 8 ▁May ▁ 1 8 4 9 ▁in ▁R use , ▁the ▁administrative ▁centre ▁of ▁Dan ube ▁Province , ▁Ott oman ▁Empire , ▁in ▁the ▁family ▁of ▁Ti ho ▁O bre ten ov ▁— ▁a ▁wealth y ▁and ▁educated ▁Bulgar ian ▁of ▁that ▁time ▁— ▁and ▁Ton ka ▁O bre ten ova . ▁ ▁In ▁January ▁ 1 8 6 3 , ▁being ▁a ▁student ▁in ▁a ▁local ▁school , ▁Nik ola ▁O bre ten ov ▁took ▁part ▁in ▁the ▁exp ulsion ▁of ▁the ▁Greek ▁bishop ▁S ines iy . ▁Next ▁year ▁he ▁graduated , ▁and ▁in ▁the ▁aut umn ▁he ▁went ▁to ▁his ▁father ▁in ▁the ▁village ▁of ▁Sak cha ▁in ▁Northern ▁Dob ru ja ▁( mod ern ▁Roman ia ). ▁They ▁established ▁a ▁Bulgar ian ▁school ▁there , ▁which ▁existed ▁until ▁March ▁ 1 8 6 6 . ▁ ▁In vol vement ▁in ▁revolution ary ▁organizations ▁▁ ▁From ▁November ▁ 1 8 6 7 ▁on , ▁Nik ola ▁O bre ten ov ▁was ▁a ▁li br arian ▁and ▁a ▁member ▁of ▁the ▁board ▁of ▁trust ees ▁of ▁the ▁Z ora ▁cultural ▁club , ▁established ▁in ▁ 1 8 6 6 ▁by ▁Drag an ▁Ts ank ov ▁and ▁other ▁intellect uals . ▁The ▁club ▁turned ▁into