a public monument
... that the sons of Pyotr Rumyantsev turned down the offer of a palace built at public expense to honour their father, in preference for a public monument?
... that the sons of <a href="./Pyotr_Rumyantsev" id="mwBwQ" rel="mw:WikiLink" title="Pyotr Rumyantsev">Pyotr Rumyantsev</a> turned down the offer of a palace built at public expense to honour their father, in preference for <b id="mwBwU"><a href="./Rumyantsev_Obelisk" id="mwBwY" rel="mw:WikiLink" title="Rumyantsev Obelisk">a public monument</a></b>?