Zalduondo, citada en la Reja de San Millán Historical milestone · Zalduondo, Cuadrilla de Salvatierra/Agurain, Álava Image of Zalduondo, not of the place itself. The town's first written mention, as "Zalduhondo", appears in 1025 in the Reja de San Millán. 1025 Photo: Iñaki LLM (CC BY-SA 4.0) What to see and do in Zalduondo