Duke of Wellington is a hereditary title of the senior rank in the Peerage of the United Kingdom. It derived from Wellington in Somerset, and was created for Arthur Wellesley, 1st Marquess of Wellington (born The Hon. Arthur Wesley) (1769–1852), the Anglo-Irish Army leader and twice British Prime Minister. Unclear references to "the Duke of Wellington" generally refer to the 1st Duke of Wellington unless the context suggests a later date. He led the decisive victory with Gebhard Leberecht von Blücher over Napoleon Bonaparte's forces at Waterloo in Brabant (now Walloon Brabant, Belgium).