In 1655, the Ciudad Colonial was submitted to a siege led by the English officers William Penn and Robert Venables. The 1655 invasion was thwarted by Spanish troops commanded by the Captain General of the Colony, Don Bernardino de Meneses y Bracamonte, Count of Peñalva, to whom the Puerta del Conde ("Gate of the Count") is named after. The defensive wall was modified during this episode. Prior to the invasion, there was a fort at the site where the Puerta del Conde is today, Fuerte San Genaro. It is believed that the modification that occurred after the siege involved the expansion of the wall to the fort, effectively creating a bastion, "El Baluarte del Conde".