Architonnerre
... that a steam-powered cannon, the Architonnerre, was described by Leonardo da Vinci in the 15th century, but he attributed it to Archimedes of the 3rd century BC?
... that a <a href="./Steam_cannon" id="mwBCo" rel="mw:WikiLink" title="Steam cannon">steam-powered cannon</a>, the <b id="mwBCs"><a href="./Architonnerre" id="mwBCw" rel="mw:WikiLink" title="Architonnerre">Architonnerre</a></b>, was described by <a href="./Leonardo_da_Vinci" id="mwBC0" rel="mw:WikiLink" title="Leonardo da Vinci">Leonardo da Vinci</a> in the 15th century, but he attributed it to <a href="./Archimedes" id="mwBC4" rel="mw:WikiLink" title="Archimedes">Archimedes</a> of the 3rd century BC?