Roger-Yves Bost, alias "Bosty", began his career riding ponies and achieved his first success at the tender age of eight, winning two French pony titles, before going on to win a silver medal at the European Championships aged 12. In 1983, he was crowned Young European Rider Champion riding Jorphée du Prieur, a mare with whom he would go on to win four team silver medals and individual events, at the subsequent European Young Riders Championships. Norton de Rhuys is the horse that took "Bosty" to the very top, to the title of French Champion in 1988 and team triumph at the World Equestrian Games in 1990.
From that moment on, "Bosty" became an essential stalwart of French national teams. He won two team silver medals at the World Championships in 1998 and 1994, team gold at the Mediterranean Games in 1993, team bronze at the European Championships in 1995, and a string of international Grand Prix. 2012 has been a fine year so far for the French rider, with wins in CSI 5* events in Basel and Doha, and a victory in the FEI Nations Cup in Aix-La-Chapelle with the French team. In 2013, he became European champion with Castle Forbes Myrtille Paulois ; a first individual victory but more important, a reward recognized by all international riders.
• Team silver at the World Championships in 1998 (Airborne Montecillo) and 1994 (Souviens toi III)
• World Team Champion in 1990 (Norton de Rhuys)
• European Champion 2013 (Castle Forbes Myrtille Paulois)
• Team bronze at the European Championships in 1995 (Souviens toi III)
• Team gold at the Mediterranean Games in 1993 (Norton de Rhuys)
• French Champion in 1998 (Norton de Rhuys)