Pierre Gaspard was a French mountain climber, one of the greatest mountain guides in the silver age of alpinism. He made the first ascent of La Meije on 16 August 1877 with his son and Emmanuel Boileau de Castelnau. Their ascent followed the south buttress Arête du Promontoire, which became the "normal route".

Henri Emmanuel Boileau, baron de Castelnau (1857-1923) was a French alpinist and sportsman who took part in the first ascent of the Meije. After his career as an alpinist he competed as an amateur cyclist.