<page_title> Bulgarian–Serbian wars (medieval) </page_title> <section_title> Conflicts </section_title> <table> <cell> Bulgar–Serb War (839–842) <col_header> Conflict </col_header> </cell> <cell> 839–842 <col_header> Time period </col_header> </cell> <cell> Presian <col_header> Bulgarian commander </col_header> </cell> </table>
The first war between Bulgarians and Serbs occurred during the reign of Presian between 839 and 842.