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Batalha Monastery (Mosteiro de Santa Maria da Vitoria de Batalha) is a magnificent example of medieval Portuguese architecture. In 1385, King Joao I vowed that if his outnumbered army defeated the Castilians at the important Battle of Aljubarrota, he would build a magnificent monastery dedicated to the Virgin Mary. The Unfinished Chapels, also known as the Pantheon of King Duarte, consist of an octagonal building situated behind the chancel. Work on the chapels was commissioned by King Duarte in 1434. In one of the chapels, the tomb effigy of D. Duarte lies hand-in-hand beside his wife, Leonor of Aragon, in the center of the rotunda area. The upper level is home to a beautiful Renaissance balcony. The Monastery was designated a World Heritage Site in 1983.