Petro Leopoldo Archiduci Austria Francisci I Lotharincii Caes Aug Filio Magno Etruria Duci Paterni in Senense Lycaeum Animi Non minus quam Regiae potestatis haeredi Imperium Feliciter Ineunti Antonius Eques Barcaglius Rector Pos an MDCCLXVI Ferdinandus III Etruriae Suae votis Tandem redditus Dum apud s Vigilii aedes novum lycaeum instituit Hoc vetus ad bonas artes Excolendas fovendas augendas Senensibus Largitur Anno MDCCCXVI

English translation: "Petrus Leopold, Archduke of Austria, Francis 1 Lotharincii AES Aug son of a great Tuscany led ancestral Senense Lyceum is not less than the seat of power to an empire successfully entering Anthony Knight Barcaglius Guide Pos or 1766 Ferrante 3 Tuscany his hopes at last While at S Vigilii house the new Lycaeum institute this in developing his skills to good old foster increased Siena bestoweth 1816 [Google Translate]"