The March of Styria derived its name from the original seat of its ruling Otakar dynasty: Steyr, in today's Upper Austria, which in turn derives its name from the namesake river of Steyr, stemming from the Celtic Stiria. In the native German the area is still called "Steiermark", while in English the Latin name "Styria" is used. Until the late 19th century however, the German name "Steyer", a slightly modernized spelling of Steyr, was also common. The ancient link between the city of Steyr and Styria is also apparent in their nearly identical coats of arms, a white Panther on a green background. Styria is also popularly known as the "Green March", owing to it being the most forested of all the Austrian states, or as the "Iron Margraviate" for its long heritage of manufacturing and engineering.