Founding of the church of San Martín de Herrán Historical milestone · Valle de Tobalina, Las Merindades, Burgos Image of Valle de Tobalina, not of the place itself. The founding in 852 of the church of San Martín de Herrán, in the Valle de Tobalina, constitutes the first documentary evidence of settlement in the valley, more than a century before Castile organized itself as an independent county. 852 Photo: David Perez (CC BY 3.0) What to see and do in Valle de Tobalina