The Arms Factory of Eugi was one of the most important factories in the north of the peninsula and, together with the Factory of Orbaitzeta (Aezkoa), proved of great significance during the wars between Carlists and Liberals.
Its function formed part of the process of Enlightenment in the XVIII century which Carlos III wished to involve the artillery in.

The Royal Arms Factory of Eugi occupied a location of traditional ironworking activity. A report from the time justifies the choice of location due to the “wealth of minerals, the abundance of water and the hard-working and hardy nature of the local population”. Its ruins now appear half-concealed amidst the vegetation.
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