On the plaza's south side, the red-and-pink stone Palacio de Gobierno is Aguascalientes' most noteworthy colonial building. Once the mansion of colonial baron Marqués de Guadalupe, it dates from 1665 and has a striking courtyard with a mural of the 1914 convention by the Chilean artist Osvaldo Barra. Barra, whose mentor was Diego Rivera, also painted the mural on the south wall, a compendium of the economic and historic forces that forged Aguascalientes.