Ayllón is a municipality located in the province of Segovia, Castile and León, Spain. According to the 2007 census (INE), the municipality has a population of 1,243 inhabitants.
In 1411 a treaty, known as the Treaty of Ayllón, was signed between Portugal and Castile ending the wars of the Interregnum.
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Coordinates: 41°25′N 3°22′W / 41.417°N 3.367°W / 41.417; -3.367