Jelaskan Pórtico da Gloria dari Katedral Santiago de Compostela dalam bahasa melayu

The Pórtico da Gloria ("portico of the glory" in Galician) of the Cathedral of Santiago de Compostela is a Romanesque portico by Master Mateo and his workshop commissioned by King Ferdinand II of León.  To commemorate its completion in 1188, the date was carved on a stone and set in the cathedral, and the lintels were placed on the portico.  Finalising the complete three-piece set took until 1211, when the temple was consecrated in the presence of King Alfonso IX of León.

The portico has three round arches that correspond to the three naves of the church, supported by thick piers with pilasters. The central arch, twice as wide as the other two, has a tympanum and is divided by a central column—a mullion—containing a depiction of Saint James.  Vertically, the lower part is formed by the bases of the columns, decorated with fantastic animals, the middle portion consists of columns adorned with statues of the Apostles and the upper part supports the base of the arches crowning the three doors. The sculpture is intended to serve as an iconographic representation of various symbols derived from the Book of Revelation and books of the Old Testament.