Ferdinand IV., grand duke of Tuscany and archduke of Austria, grandson of the preceding, born June 10, 1835. He married Anna Maria, daughter of the king of Saxony, in 1856, and began to reign in 1839), after the abdication of his father Leopold II.; but a few months later the Tuscan constituent assembly declared in favor of annexation to Sardinia, which was consummated March 22, 18G0, and which involved the forfeiture of the grand-ducal crown of Tuscany.