Gaston Prost ( 1881 - 1956 ) was a French painter. Gaston Prost s works have been put up for auction numerous times, with realized prices varying from 55.57 USD for Les remparts de Sables en Provence in 2011 to 331.5 USD for Rocher à Sainte Marguerite in 2013 , based on the size and medium of the artwork.