Da'ud
... that Da'ud, the heir apparent of the last Fatimid caliph, spent almost his entire life imprisoned by the succeeding Ayyubid dynasty?
... that <b id="mwTQ"><a class="mw-redirect" href="./Da'ud_ibn_al-Adid" id="mwTg" rel="mw:WikiLink" title="Da'ud ibn al-Adid">Da'ud</a></b>, the heir apparent of the last <a href="./Fatimid_Caliphate" id="mwTw" rel="mw:WikiLink" title="Fatimid Caliphate">Fatimid</a> caliph, spent almost his entire life imprisoned by the succeeding <a href="./Ayyubid_dynasty" id="mwUA" rel="mw:WikiLink" title="Ayyubid dynasty">Ayyubid dynasty</a>?