The national flag of Albania is a red flag with a black two-headed eagle in the center. It is the only red and black flag of a recognized sovereign state. It is claimed to be derived from the similar seal of Gjergj Kastriot Skanderbeg, a 15th century Albanian who led the revolt against the Ottoman Empire that resulted in brief independence for some regions of Albania from 1443 to 1478. The current flag was officially adopted on April 7, 1992. The Albanian flag is frequently used and seen in other Albanian-speaking areas such as Kosovo, Albanian areas of Macedonia, and the Albanian Diaspora.