Alfonso Rodríguez was a Spanish mariner and merchant, who was colonizer in the cities of Rio de Janeiro and Buenos Aires in the 1620s.

[1] He served as a captain of commercial ships, having an active participation in the commerce of Río de la Plata towards the middle of the 17th century.

Installed in Buenos Aires he participated in the economic activities of Río de la Plata as a naval merchant.

[7] His wife's family was linked to Manuel de Frías, a distinguished military man born in Asunción, who held various political posts in the Río de la Plata, including that of lieutenant governor of Buenos Aires.

[8] His wife Ana de la Trinidad Martínez y Gil de Freytas was the direct maternal ancestor (mitochondrial line) of distinguished Argentine politicians and military, including Juan Lucio Somoza, Sinforoso Amoedo, Juan Manuel Bayá, Apolinario Linera, Juan José Canaveris and Miguel Gerónimo de Esparza y Rodríguez.