The <a href="https://en.wikipedia.org/wiki/Hijrah" id="mwEQ" rel="mw:WikiLink" title="Hijrah">Hijrah</a> of <a href="https://en.wikipedia.org/wiki/Muhammad" id="mwEg" rel="mw:WikiLink" title="Muhammad">Muhammad</a> begins, marking the beginning of the <a href="https://en.wikipedia.org/wiki/Islamic_calendar" id="mwEw" rel="mw:WikiLink" title="Islamic calendar">Islamic calendar</a>.