Today, 526 years ago, on September 22, 1499 (August 18, 1499), the Holy Roman Empire Emperor Maximilian I recognized Switzerland's independence. On September 22, 1499, the Basel Treaty, the Holy Roman Empire Emperor Maximilian I recognized Switzerland's independence. Switzerland was gradually developed since 1291 under the sovereignty of the Holy Roman Empire, gradually under the sovereignty of the Holy Roman Empire. From 1351 to 1353, Zurich joined the original Forest 3 states, establishing a partial border between the present German province of Austria (Classic) and Switzerland. Switzerland occupied Aragua (Aragu) in 1415 and expanded its border to the west in 1460 and occupied Dougau (Thurgau), breaking the