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The flag of Austria (Austrian German: Flagge Österreichs) has three equal horizontal bands of red (top), white, and red. It is considered one of the oldest national symbols, with its first recorded use in 1230. The Austrian triband originated from the arms of the Babenberg dynasty. Differently from, for example, the black-and-yellow banner of the Habsburgs, the red-white-red flag was from very early associated not with a reigning family or monarch, but with the country itself. Other than serving as the flag of Austria since 1230, it was adopted as naval ensign and flags of the Grand Duchy of Tuscany and Duchy of Modena and Reggio in the 18th and 19th century respectively, as both were ruled by cadet branches of the House of Habsburg.

Source: Wikipedia