Empress Constantina
...that according to John of Ephesus, in 583, Empress Constantina, consort of Maurice, gave birth to the first heir born to a reigning Byzantine Emperor in over 100 years?
...that according to <a href="./John_of_Ephesus" id="mwDBQ" rel="mw:WikiLink" title="John of Ephesus">John of Ephesus</a>, in 583, <b id="mwDBU"><a class="mw-redirect" href="./Constantina,_wife_of_Maurice" id="mwDBY" rel="mw:WikiLink" title="Constantina, wife of Maurice">Empress Constantina</a></b>, consort of <a href="./Maurice_(emperor)" id="mwDBc" rel="mw:WikiLink" title="Maurice (emperor)">Maurice</a>, gave birth to the first <a class="mw-redirect" href="./Heir" id="mwDBg" rel="mw:WikiLink" title="Heir">heir</a> born to a reigning <a href="./Byzantine_Empire" id="mwDBk" rel="mw:WikiLink" title="Byzantine Empire">Byzantine Emperor</a> in over 100 years?