Haro, as the rest of La Rioja, is a borderland. In the past it was inhabited by berones. During the romanization of the Iberian Peninsula, it is known about the "Castrum Bilibium" existence, in The Shells on Ebro river, opposite to Salinillas de Buradon. San Braulio, Zaragoza's obispe, when in VII century wrote about San Millan's life, mentioned this castle.
The historical foundation day of Haro village was around X century. In 117, Haro is donated by Alfonso VI of Castilla to Diego Lopez, Lord of Vizcaya, for his support in the war against Aragonese king. And since then, the Haro name had benn joined to Lords of Vizcaya till they lost in 1288 in the military confrontation between Sancho IV of Castilla and Lope de Haro, consequence of this confrontation was the death of the last one and the conquest by the king, where he called the court, known as "Haro court" in Villabona place.