Mathias Metternich
... that mathematician Mathias Metternich was one of the founders of the Jacobin club of the Republic of Mainz?
... that mathematician <b id="mwBag"><a href="./Mathias_Metternich" id="mwBak" rel="mw:WikiLink" title="Mathias Metternich">Mathias Metternich</a></b> was one of the founders of the Jacobin club of the <a href="./Republic_of_Mainz" id="mwBao" rel="mw:WikiLink" title="Republic of Mainz">Republic of Mainz</a>?