It is a town belonging to the Burgo de Osma region in the province of Soria, which together with Herrera de Soria and Nafría de Ucero runs a condominium known as Comunidad de Herrera de Soria, Nafría de Ucero y Ucero. Its lands are irrigated by the rivers Ucero, Lobos and Chico. Ucero was an important medieval town that was founded after the repopulation of Osma in the 12th century, although the human presence in the area of Ucero goes back to Prehistory, from the Bronze Age there are numerous sites of engravings and cave paintings such as those in the cave of Galiana Alta, cave Conejos, those in the cave of Polvorista... From the Celtiberian period some castros and a necropolis have been found. The Romans also left their mark on the place where they built a luxurious Villa of Ucero, San Martín, and also built a canal to carry water to the Roman city of Uxama. Then the Visigoths arrived and with the Arab invasion the territory was abandoned until it was repopulated in the 12th century. At the beginning of the 13th century it became a lordship land, Alfonso X the Sabio donated it to Juan García de Ucero, and in 1302 the Bishop of Osma, Juan Pérez de Ascarón, bought it and since then the lordship of Ucero remained in the possession of the bishops. In the 19th century the town was the head of the Ucero district in the Soria municipality, and had the jurisdiction of an abbot under the authority of the mayor of the lordship, who was appointed by the Bishop of Osma.
The town of Ucero is presided over by its medieval castle built in the 13th and 14th centuries and traditionally associated with the Templars. A steep walk brings the visitor closer to the castle which, although in ruins, still has part of its walls and the tower of homage, which is crowned with corbels and in which there is a window with pointed arches. From the castle, declared a monument in 1949, there is an impressive view of the Ucero and Chico Rivers, as well as the Lobos River Canyon. Next to the castle are, for some, the ruins of the Romanesque hermitage of San Juan de Otero, which for others are those of the hermitage of the Virgen de la Villavieja. In the village and between the houses is the parish church of San Juan Bautista. The Cave of La Zorra is another curious and highly recommended visit, where a section of the water supply channel built by the Romans is crossed.
Ucero celebrates its patron saint's festivities from 24 to 26 August in honour of the Virgen de la Salud and San Bartolomé.
Traditional and more than deserved is the fame, gastronomically speaking, of the trout of the Ucero River.
The village of Ucero is located in an area of Cretaceous origin. Its terrain, a limestone complex, has been eroded to form a Karst where caves, chasms and sinkholes abound as well as numerous known sources, such as Fuentillas, Cave La Zorra, Ucero, Guardana, Cave Batán, Fuentegómez, Monte, Valdecea, Ermita, Fría, and Laguna Dehesa de Duero.
A popular story tells that in the cave of El Polvorista, under three stones, three tests are hidden, like a gymkhana, and whoever passes them will find a fabulous treasure.
Ucero can be reached by following the SO-920 regional road that links San Leonardo de Yagüe with El Burgo de Osma.
Ucero has a bus service stop that on Tuesdays and Saturdays connects it with Burgo de Osma. The telephone numbers for further information are 677 442 678 and 975 372 663
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