<a href="https://en.wikipedia.org/wiki/Byzantine–Bulgarian_wars" id="mwLQ" rel="mw:WikiLink" title="Byzantine–Bulgarian wars">Byzantine–Bulgarian wars</a>: <a href="https://en.wikipedia.org/wiki/Battle_of_Kleidion" id="mwLg" rel="mw:WikiLink" title="Battle of Kleidion">Battle of Kleidion</a>: <a href="https://en.wikipedia.org/wiki/List_of_Byzantine_emperors" id="mwLw" rel="mw:WikiLink" title="List of Byzantine emperors">Byzantine emperor</a> <a href="https://en.wikipedia.org/wiki/Basil_II" id="mwMA" rel="mw:WikiLink" title="Basil II">Basil II</a> inflicts a decisive defeat on the <a href="https://en.wikipedia.org/wiki/Bulgaria" id="mwMQ" rel="mw:WikiLink" title="Bulgaria">Bulgarian</a> army, and his subsequent treatment of 15,000 prisoners reportedly causes <a href="https://en.wikipedia.org/wiki/Samuel_of_Bulgaria" id="mwMg" rel="mw:WikiLink" title="Samuel of Bulgaria">Tsar Samuil of Bulgaria</a> to die of a heart attack less than three months later, on <a href="https://en.wikipedia.org/wiki/October_6" id="mwMw" rel="mw:WikiLink" title="October 6">October 6</a>.