The Duke Dmitrь got the village Kozjak as his inherited property from the Serbian Despot Konstantin Dragaš for his loyal service (Iako istini i vьsesrьdьčni surodnikь i brat gospodstva mi vojevoda Dmitrь k věčnomu Tvorьcu i nekonьčavajemu i nemimohodimu i vьsa mira sego ni vь čto že vьměni i vladicě svojemu Hristu priveza se. I sela iže jestь iznašьlь brat gospodstva mi vojevoda Dmitrь, iže mu jestь darovalo gospodstvo mi za jegovo pravověrno porabotanie). He donated the village with all boundaries, rights, vineyard, mills and fruit trees to the Hilandar Monastery. The Serbian Despot Konstantin Dragaš confirmed the endowment of Duke Dmitrь in a charter from 1388/1389. In the boundary description of the village Kozjak the village Crьvulje is attested (A se megja sela toga Kozijaka: ... tako i niz reku Elьšinicu i do gradišta nad Crьvuljemь i ōd gradišta na dělь izlětši, tako i niz Gabrovь Dolь i ōd Gabrova Dola dolu na rasputije i ōd rasputija koi grěde putь ōd Crьvulje). The village Crьvulje is registered in the Defter for the Sanjak Köstendil in the years 1519, 1550 and 1573 as Crvulevo.