Léon Scieur was a Belgian cyclist who won the 1921 Tour de France, along with stages 3 and 10. His first great victory was the 1920 Liège–Bastogne–Liège; he won a stage and finished fourth in the 1919 and 1920 Tours de France. In the yellow jersey at the 1921 Tour de France after stage 10 — 1 stage, July 14 to July 15, taking it from Firmin Lambot. Wiki link