By the middle of the XVIth century, two retables are going to define the romanistic reredos: The altarpiece in Astorga, a work by Gaspar Becerra assisted by Juan de Anchieta and others, an the retable of Sta. Claire Briviesca. They relate each other, though the reredos of Briviesca is inffluenced by the little earlier one in Astorga. They both open a new type of design, the so called romunstic scheme, partly after Michelangelo's architecture, and both also get a greta repercussion in the area of Burgos, Basque Country, Navarre, and Rioja, till in 1500 they are substituted by the Herrerian or purist retable.