Fundación de Plasencia en 1186 Historical milestone · Plasencia, Comarca de Monfragüe y su Entorno, Cáceres Image of Plasencia, not of the place itself. The city was founded by King Alfonso VIII of Castile in 1186 as a royal stronghold facing the kingdom of León and al-Ándalus; it remained under the crown's direct jurisdiction until 1442. Fundada en 1186 Photo: Olarcos (Public domain) What to see and do in Plasencia