Opus Majus
...that Roger Bacon sent his Opus Majus, a treatise of natural science, to Pope Clement IV in 1267?
...that <a href="./Roger_Bacon" id="mwA4g" rel="mw:WikiLink" title="Roger Bacon">Roger Bacon</a> sent his <i id="mwA4k"><b id="mwA4o"><a href="./Opus_Majus" id="mwA4s" rel="mw:WikiLink" title="Opus Majus">Opus Majus</a></b></i>, a treatise of <a href="./Natural_science" id="mwA4w" rel="mw:WikiLink" title="Natural science">natural science</a>, to <a href="./Pope_Clement_IV" id="mwA40" rel="mw:WikiLink" title="Pope Clement IV">Pope Clement IV</a> in 1267?