Piedmont returned to the Savoy from France due to the role played by the duke Emmanuel Philibert in the battle of St Quentin during the Italian War of 1551–1559. The House of Savoy was "Italianized" at the end of the Italian wars, as Emmanuel Philibert made Turin the capital of the savoyard state and Italian the official language. The House of Medici kept ruling Florence, thanks to an agreement signed between the Pope and Charles V in 1530, and was later recognized as the ruling family of the Grand Duchy of Tuscany by Pope Pius V. The same Pope arranged the Holy League, a coalition of Venice and other maritime states that defeated the invading Ottoman forces at the naval battle of Lepanto (1571).