Irish immigrants played an instrumental role in Puerto Rico's economy. One of the most important industries of the island was the sugar industry. Among the successful businessmen in this industry were Miguel Conway, who owned a plantation in the town of Hatillo and Juan Nagle whose plantation was located in Río Piedras. General Alexander O'Reilly, "Father of the Puerto Rican Militia", named Tomas O'Daly chief engineer of modernising the defences of San Juan, this included the fortress of San Cristóbal. Tomas O'Daly and Miguel Kirwan were partners in the "Hacienda San Patricio", which they named after the patron saint of Ireland, Saint Patrick. A relative of O'Daly, Demetrio O'Daly, succeeded Captain Ramon Power y Giralt as the island's delegate to the Spanish Courts. The plantation no longer exists, however the land in which the plantation was located is now a San Patricio suburb with a shopping mall by the same name. The Quinlan family established two plantations, one in the town of Toa Baja and the other in Loíza. Puerto Ricans of Irish descent were also instrumental in the development of the island's tobacco industry. Among them Miguel Conboy who was a founder of the tobacco trade in Puerto Rico.