Gregorio Martinez Hernandez is an en event rider from Mexico with an international competition record, horses competed by Gregorio Martinez Hernandez includes Umeco, Venus and Virtuosa. In 2011 Gregorio Martinez Hernandez represented America at the Pan American games with the horse Noblesa.
Gregorio Werthein is a showjumping rider from Argentina who has represented his country at the highest level including the Olympics, below you can watch Gregorio Werthein in action at the 2004 Olympic games in Athens riding Calwaro.