Boileau de Castelnau was born in Nîmes in 1857. He was sickly as a child.
Alpine career
He began mountain climbing in the Pyrenees at the age of thirteen, climbing Maladeta and Aneto. Between 1872 and 1874, he climbed Mont Blanc four times, as well as climbing the Matterhorn, the Jungfrau, and many other mountains. At seventeen, he joined the Club alpin français founded the previous year. In 1874, Boileau de Castelnau traveled to Chamonix to climb Mont Blanc. Forced to descend by a storm, he made the acquaintance back in Chamonix of Henry Duhamel, creator of the French Alpine Club and Haut-Dauphiné specialist. Boileau de Castelnau told Duhamel of his desire to achieve the ascent of the Grand Pic de la Meije. Tired of the bad weather that prevailed in Chamonix, the following year the two men engaged three guides in the valley and went to La Grave and the "rocher de l'aigle" to bivouac. The company was tempted by the north face with the three guides but the expedition was blocked by an overly dangerous passage in a corridor formed of black ice and sleet. That year they reached the central peak of the Meije, conquered by W. A. B. Coolidge five years earlier. Later, in Grenoble, Boileau de Castelnau met the President of the Société des touristes du Dauphiné, and in 1876 met the guide Pierre Gaspard and his son. They formed one of the most brilliant ropes of their era, quickly achieving many first ascents in the 1876 and 1877 seasons. On 4 August 1877, Boileau de Castelnau and Gaspard tried a new ascent of the Meije by the south side, a route attempted the previous year by Henry Duhamel. With difficulty and thanks to Gaspard's audacity, they came to the end of the wall that Duhamel thought impassable, both climbing with bare feet. Forced to abandon it due to lack of time, they left a fixed rope in place. On 16 August, Boileau de Castelnau, Gaspard and his son reached the top, not without difficulty: the Meije was defeated. The descent was even more challenging than the ascent and they were obliged to bivouac, on the night of 16 August, on an uncomfortable ledge but managed to return to La Grave the following day. W. A. B. Coolidge, who had hoped to be the first to climb the Meije, initially refused to believe that the relatively unknown Boileau de Castelnau had climbed it. Coolidge himself climbed the Meije by Boileau de Castelnau's route in July 1878 to confirm his account. The Alpine career of the very young Boileau de Castelnau, interrupted by military service the following year, finally ended in 1879.
Post-alpine career
He subsequently devoted himself to managing his estates in Languedoc near Montpellier. He joined a foot-racing team and won the Mile Race in Germany. He attended the Faculty of Medicine in Paris, but did not write a thesis or practice medicine. In later years he became interested in bicycling, driving motorcars, and flying balloons and airplanes.
Family and death
Boileau de Castelnau was married with a son and daughter. He died at his home in Montpellier in 1923 at the age of 65.
