Glera
... that when the Italian sparkling wine Prosecco received DOCG status, the name of its grape changed from Prosecco to Glera so others could not make wine with the grape and call it Prosecco?
... that when the <a class="mw-redirect" href="./Italian_(wine)" id="mwoA" rel="mw:WikiLink" title="Italian (wine)">Italian</a> <a href="./Sparkling_wine" id="mwoQ" rel="mw:WikiLink" title="Sparkling wine">sparkling wine</a> <a href="./Prosecco" id="mwog" rel="mw:WikiLink" title="Prosecco">Prosecco</a> received <a class="mw-redirect" href="./DOCG" id="mwow" rel="mw:WikiLink" title="DOCG">DOCG</a> status, the name of its <a class="mw-redirect" href="./Grape_(variety)" id="mwpA" rel="mw:WikiLink" title="Grape (variety)">grape</a> changed from Prosecco to <b id="mwpQ"><a href="./Glera_(grape)" id="mwpg" rel="mw:WikiLink" title="Glera (grape)">Glera</a></b> so others could not make wine with the grape and call it Prosecco?