 Its borders stretch from Huécija and Bentarique to the east, Instinción to the west, Alboloduy to the north, and a part of Bentarique to the south.Íllar appeared to be named by the Andalusian geographer Idrisi in the 12th century for the purpose of colonization and to increase tax capacity.From the 13th century, when the Kingdom of Granada was the only Muslim territory in the Iberian Peninsula, Íllar formed a part, together with other 10 localities, of "Marchena's taha", a traditional fief of the al-Nayar family.