Constantine
... that Constantine, an infant Byzantine emperor, reportedly died by drowning in a cistern after escaping the care of his nurse?
... that <b id="mwBZU"><a href="./Constantine_(son_of_Theophilos)" id="mwBZY" rel="mw:WikiLink" title="Constantine (son of Theophilos)">Constantine</a></b>, an infant Byzantine emperor, reportedly died by drowning in a <a href="./Cistern" id="mwBZc" rel="mw:WikiLink" title="Cistern">cistern</a> after escaping the care of his nurse?