The largest and most powerful warships ever built in Italy, the battleships of the Littorio class, were the first "35,000 tonners" to come under the provisions of the Washington Treaty. Although the Washington Navel Conference of 1922 gave Italy the authority to build up to 182,800 tons of new capital ships (including 70,000 tons prior to 1932), the Italians waited more than a decade before beginning construction.