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The current hospital and church of São Marcos (St. Mark) date back to the 18th century. They were built according to a Carlos Amarante design, after whom the square is named.
Baroque in style, the verticality of the Church with its two towers clearly contrasts with the horizontal, symmetrical shape of the adjoining hospitals to create an overall harmonious impression. Diogo de Sousa is buried in the main chapel of the church in a white jade tomb worked in a mosaic fashion (source visitportugal.com)