The <a href="https://en.wikipedia.org/wiki/Siena" id="mwKA" rel="mw:WikiLink" title="Siena">Sienese</a> <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Ghibellines" id="mwKQ" rel="mw:WikiLink" title="Ghibellines">Ghibellines</a>, supported by the forces of <a href="https://en.wikipedia.org/wiki/Manfred,_King_of_Sicily" id="mwKg" rel="mw:WikiLink" title="Manfred, King of Sicily">Manfred, King of Sicily</a>, defeat the <a href="https://en.wikipedia.org/wiki/Florence" id="mwKw" rel="mw:WikiLink" title="Florence">Florentine</a> <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Guelphs" id="mwLA" rel="mw:WikiLink" title="Guelphs">Guelphs</a> at <a href="https://en.wikipedia.org/wiki/Battle_of_Montaperti" id="mwLQ" rel="mw:WikiLink" title="Battle of Montaperti">Montaperti</a>.