Festivities of Seno Activity · Seno, Bajo Aragón, Teruel Image of Seno, not of the place itself. Seno celebrates its winter festivity in honor of San Valero on the last weekend of January, and its summer ones for Santa Elena and San Roque from 14 to 16 August. It received a Templar founding charter in 1282, and on 23 July 1789 Carlos IV definitively separated it from Castellote. Photo: Smartinezh (CC BY-SA 3.0) What to see and do in Seno