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Viseu Cathedral is a Latin cross church with a three-aisled nave, transept and three Eastern chapels. The main façade is flanked by two towers. The outer, lateral walls of the church have a heavy, menacing appearance, typical of Portuguese mediaeval cathedrals, being partially decorated with merlons. In the interior, all aisles are of approximately equal height, resembling a hall church. The stone rib vaulting is supported by massive pillars and was built between 1505 and 1513, being an outstanding example of Manueline architecture. Some ribs of the roof (liernes) are shaped like twisted ropes and knots, typical Manueline decorative motifs