Based on cave paintings and engravings and also stone implements that have been found in the Aia district, it is believed that human habitation of the area dates back to over 10,000 years ago.

The town was also mentioned as being part of the Union of Sayaz in the Decree of the Brotherhood of the Province of Gupuzkoa in 1375.

[citation needed] The park contains a number of ruins of old mills, foundries, and farmhouses, and some ancient burial mounds dating back 5,000 years.

[citation needed] The forge which can be seen today was built in 1754 by the Lord of Laurgain Palace over the ruins of an earlier version.

Lying at the bottom of a deep valley near Manterola farmhouse, it used the river's hydraulic energy to power its bellows and turn its waterwheels.