Álvaro Obregón (possibly O'Brian or O'Brien) was president of Mexico during 1920–24 and Obregón city and airport are named in his honour. Mexico also has a large number of people of Irish ancestry, among them the actor Anthony Quinn. There are monuments in Mexico City paying tribute to those Irish who fought for Mexico in the 19th century. There is a monument to Los Patricios in the fort of Churubusco. During the Great Famine, thousands of Irish immigrants entered the country. Other Mexicans of Irish descent are: Romulo O'Farril, Juan O'Gorman, Edmundo O'Gorman and Alejo Bay (Governor of the state of Sonora).