Olloniego

Prehistoric settlers left traces here at the hilltop castro of El Pico Castiello, beside what would later become Tudela Castle. By 1145, in the reign of Alfonso VI, Olloniego was already an official toll point on the road into Oviedo, with the revenues split between the Monastery of San Pelayo, the cathedral chapter, and the monastery of La Vega. Philip II later sold the town to Rodrigo Bernaldo de Miranda for 608,080 maravedíes.

For much of the modern era the area was Oviedo's main coal-mining district, but from the late 1990s the mines gave way to two large industrial estates, Olloniego-Tudela I and II, built at a cost of 33 million euros across more than a million square metres, now home mainly to storage and distribution companies.

Olloniego's historic core is a designated cultural heritage zone. Its oldest surviving structure is the Torre de los Muñiz, a medieval tower that was eventually absorbed into the Palacio de los Quirós alongside it. The old medieval bridge over the River Nalón is still standing but has been out of use since the river's course shifted away from it.

The parish church, dedicated to San Pelayo, dates from a later period and is notable for its slender bell tower. The Romanesque apse of an earlier church of the same dedication survives as the chapel of the local cemetery. The Fuente de los Llocos, also known as the Fuente de la Arqueta, is a baroque fountain recorded as early as 1777 as a resting point for pilgrims heading to Oviedo.

Tudela Castle, also a listed monument, was originally built by Alfonso III el Magno on the site of an ancient castro, later ceded to the bishopric by Alfonso VII of Castile, and eventually ordered demolished, only ruins remain. The area's coal-mining past is visible at Pozo San José, a shaft constructed in 1958 that operated until 1972, was reopened by the state mining company Hunosa in 1982, and closed for good in 1993. Its headframe and several outbuildings are still standing.

Remains of the older Mina Vicentina can also be seen nearby.