The castle of Zamora has six turrets and stands on a rock with a barbican.
The Treason Gate in very important because Bellido Dolfos came in through this gate as he was been chased by El Cid after assassinating the king Don Sancho. The famous Bishop's Gate was built in 1230.
Zamora was the general headquarters of the frontier in the 18th century, sue to its walls and the medieval castle, whose interior was reformed.
In the 18th century Juan Martín Cermeño proposes some fortification works that included, besides the crenellated front on the flat side of the town, a brand new fortress on the heights of Santa Susana, from where it would be possible to dominate the town with the artillery.
Around 893, Alfonso II took and fortified the town with the aid of the Mozarabic population. However, Almanzor took the town in the late 10th century.
Source: Web server of Instituto de Turismo de España, TURESPAÑA.