Giovan Vincenzo Gravina wrote a history of Roman law, specially distinguished for its accuracy and elegance.
1835) and Giovan Battista Vico, his first works were an article in the Biblioteca Italiana entitled "Mente di Gian Domenico Romagnosi" (1835), and a complete edition of the works of Vico, prefaced by an appreciation (1835).
In 1369 Lucca was taken from them by the emperor Charles IV.; and afterwards Giovan Galeazzo Visconti, known as the count of Virtu, determined to forward his ambitious designs upon the whole of Italy by wresting Pisa from the Gambacorti.
During the interregnum that followed Ottavio again tried to induce the governor of Parma to give up the city to him, but met with no better success; however, on the election of Giovan Maria Ciocchi (Julius III.) the duchy was conferred on him (1551).
Giovan Gastone was the last Medicean grand duke; being childless, it was agreed by the treaty of Vienna that at his death Tuscany should be given to Francis, duke of Lorraine, husband of the archduchess Maria Theresa, afterwards empress.
In 1737 Giovan Gastone died,' and Francis II., after taking possession of the grand duchy, appointed a regency under the prince of Craon and departed for Austria never to return.