The <a href="https://en.wikipedia.org/wiki/Uprising_of_Asen_and_Peter" id="mwEQ" rel="mw:WikiLink" title="Uprising of Asen and Peter">Uprising of Asen and Peter</a> begins on the feast day of St. Demetrius of Thessaloniki and ends with the creation of the <a href="https://en.wikipedia.org/wiki/Second_Bulgarian_Empire" id="mwEg" rel="mw:WikiLink" title="Second Bulgarian Empire">Second Bulgarian Empire</a>.