On the right hand side of the transept is the Royal Pantheon a room built in the end of the 18th century in neo-gothic style, it is the earliest neo-gothic building in Portugal to house to tombs of the Portuguese monarchy.
The Royal Pantheon has the 13th-century tombs of the Queens of Portugal, Urraca of Castile and Beatriz of Castile, married respectively to Kings Afonso II and Afonso III. Besides, there are smaller tombs of unidentified princes of which this is one.
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