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On the sign:
[Emblem of the city of Madrid]
EN ESTA CASA VIVIÓ Y MURIÓ EN 1905 EL JURISTA JOSÉ MARÍA MANRESA NAVARRO CUYA OBRA SE REFLEJA EN EL CÓDIGO CIVIL DE 1889
The sign is in the house where jurist José María Manresa Navarro (1818-1905) lived until the day of his death. He was among the drafters of the Civil Code of Spain in 1889 which established the civil law procedure.