This picturesque town, which served as inspiration for the great Francisco de Goya, nestles in the foothills of the Sierra de Ávila mountains, close to the River Corneja valley. Declared the seat of a bishopric, it enjoyed a privileged status throughout the 14th and 15th centuries, and was the home of many major figures including Alonso de Madrigal, Juan de Carvajal and the man it was named after - Juan de Bonilla, a Franciscan, writer and Prior of Villasilos in Palencia.

In the town square stands the magnificent Collegiate Church of San Martín, a superb Gothic temple dating back to the first half of the 15th century, and which boasts a single wide nave, eye-catching gargoyles and jutting buttresses, all reflecting the town’s former medieval splendor.