Abbasid invasion of Asia Minor
... that the Abbasid invasion of Asia Minor in 806 was the largest expedition ever launched by the Abbasid Caliphate, and forced Byzantine emperor Nikephoros I to pay a head tax for himself and his son?
... that the <b id="mwjA"><a href="./Abbasid_invasion_of_Asia_Minor_(806)" id="mwjQ" rel="mw:WikiLink" title="Abbasid invasion of Asia Minor (806)">Abbasid invasion of Asia Minor</a></b> in 806 was the largest expedition ever launched by the <a href="./Abbasid_Caliphate" id="mwjg" rel="mw:WikiLink" title="Abbasid Caliphate">Abbasid Caliphate</a>, and forced <a class="mw-redirect" href="./Byzantine_emperor" id="mwjw" rel="mw:WikiLink" title="Byzantine emperor">Byzantine emperor</a> <a href="./Nikephoros_I" id="mwkA" rel="mw:WikiLink" title="Nikephoros I">Nikephoros I</a> to pay a <a href="./Jizya" id="mwkQ" rel="mw:WikiLink" title="Jizya">head tax</a> for himself and his son?