The Republic of Venice seized a number of places on the eastern shores of the Adriatic before 1200, mostly for commercial reasons, because pirates based there were a menace to trade. The Doge already carried the titles of Duke of Dalmatia and Duke of Istria. Later mainland possessions, which extended across Lake Garda as far west as the Adda River, were known as the “Terraferma”, and were acquired partly as a buffer against belligerent neighbours, partly to guarantee Alpine trade routes, and partly to ensure the supply of mainland wheat, on which the city depended. In building its maritime commercial empire, the Republic dominated the trade in salt, acquired control of most of the islands in the Aegean, including Cyprus and Crete, and became a major power-broker in the Near East. By the standards of the time, Venice’s stewardship of its mainland territories was relatively enlightened and the citizens of such towns as Bergamo, Brescia and Verona rallied to the defence of Venetian sovereignty when it was threatened by invaders.