Valens Aqueduct
...that the Valens Aqueduct was the major water-providing system of medieval Constantinople and Ottoman Istanbul?
...that the <b id="mwC9k"><a class="mw-redirect" href="./Valens_Aqueduct" id="mwC9o" rel="mw:WikiLink" title="Valens Aqueduct">Valens Aqueduct</a></b> was the major water-providing system of medieval <a href="./Constantinople" id="mwC9s" rel="mw:WikiLink" title="Constantinople">Constantinople</a> and <a href="./Ottoman_Empire" id="mwC9w" rel="mw:WikiLink" title="Ottoman Empire">Ottoman</a> <a href="./Istanbul" id="mwC90" rel="mw:WikiLink" title="Istanbul">Istanbul</a>?