[1] The first fully Gothic building in Portugal is the church of the Monastery of Alcobaça, a magnificent example of the clear and simple architectural forms favoured by the Cistercians.
The vault of the ambulatory is externally supported by flying buttresses, typical features of Gothic architecture and a novelty at the time in Portugal.
After the foundation of Alcobaça, the Gothic style was chiefly disseminated by mendicant orders (mainly Franciscan, Augustinians and Dominicans).
Mendicant Gothic was also adopted in several parish churches built all over the country, for instance in Sintra (Santa Maria), Mafra, Lourinhã and Loulé.
The apse of Lisbon Cathedral was totally remodelled in the first half of the 14th century, when it gained a Gothic ambulatory illuminated by a clerestory (high row of windows on the upper storey).
In the early 15th century, the building of the Monastery of Batalha, sponsored by King John I, led to a renovation of Portuguese Gothic.
The whole building is decorated with Gothic pinnacles (crockets), reliefs, large windows with intricate tracery and elaborate crenellations.
In the Alentejo and elsewhere, Mudéjar influence in several buildings is evident in the profile of windows and portals, often with horseshoe arches and a mullion, circular turrets with conical pinnacles, Islamic merlons, etc., as well as tile (azulejo) decoration.