a century of first-class centuries
... that W. G. Grace was the first cricketer to score a century of first-class centuries?
... that <a href="./W._G._Grace" id="mwDm8" rel="mw:WikiLink" title="W. G. Grace">W. G. Grace</a> was the first <a href="./Cricket" id="mwDnA" rel="mw:WikiLink" title="Cricket">cricketer</a> to score <b id="mwDnE"><a href="./List_of_first-class_cricket_centuries_by_W._G._Grace" id="mwDnI" rel="mw:WikiLink" title="List of first-class cricket centuries by W. G. Grace">a century of first-class centuries</a></b>?