The hermitage of the Virgen de la Peña de Ibrillos Monument · Ibrillos, Montes de Oca, Burgos Image of Ibrillos, not of the place itself. The hermitage crowns the hill where the fortress of Livriellos stood, disputed between Christians and Muslims at the end of the ninth century and a piece of the defensive line that ran from Cerezo de Río Tirón to Pazuengos. Photo: Ecelan (CC BY-SA 4.0) What to see and do in Ibrillos