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On the sign:
[Emblem of the city of Madrid] EN ESTA CALLE MATARON AL SECRETARIO DE DON JUAN DE AUSTRIA JUAN ESCOBEDO EL 31 DE MARZO DE 1578 NOCHE DEL LUNES DE PASCUA
Juan de Escobedo (1578-1530) Spanish politician and secretary of Don Juan of Austria, appointed to be in charge of Madrid. Was related to Antonio Pérez secretary of Felipe II, King of Spain. He was murdered in 1577, who, according to the rumor, refused the king’s orders, or discovered Antonio Pérez’s love affair.
Translation of the text on the sign: [Emblem of the city of Madrid]
IN THIS STREET THEY KILLED THE SECRETARY OF DON JUAN DE AUSTRIA JUAN ESCOBEDO ON MARCH 31, 1578 NIGHT OF EASTER MONDAY