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Illescas was populated since prehistoric times. The Greek curets, who lived there, called it Ilarcuris. The Ilarcuris, is now a school.

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From the end of the 5th century to the 2nd century a.C

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From the end of the 5th century to the 2nd century a.C

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Between these dates, the oldest data show the excavations of "El Cerrón", where a Celtiberian settlement was established.

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In this year, San Ildefonso created a monastery of "religious benitas" dedicated to the Virgin Mary, with the town that was renamed "Pueblo Dubiense", where it is not known where it was.

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a small hospital and a hermitage were also built where the Virgin of Charity was placed.

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After the Arab invasion, a citadel and some fortifications were built.

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On this date, King Alfonso VI ordered it to be rebuilt and walled by having 5 entrance doors on its perimeter.

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The king Alfonso VII signed a Barter Letter with Vicente, the Segovian Ovispo, on the lands of Aguilafuente in exchange for Illescas.

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The Cardenal Cisneros commissioned to restore the alcazar and the walled enclosure

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The town became a semi-urban nucleus where hidalgos and clérigos, with a population of 1481.

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The confiscation process affected the institutions ecclesiasticals.