De señorío a condado y anexión a Gipuzkoa Historical milestone · Oñati, Debagoiena / Alto Deba, Gipuzkoa Image of Oñati, not of the place itself. Oñati was founded in 1467 as a seigneurial town, which later became a county; it remained an independent entity until its annexation to the province of Gipuzkoa in 1845. 1467 y 1845 Photo: Gorka Bikuña (CC BY-SA 4.0) What to see and do in Oñati