From Coudenberg to Place Royale. This street is the only remaining section of a very old artery, part of the old medieval Chaussée or Steenweg , the busiest East-West commercial route. It was once one of the main axes connecting the upper and lower parts of the city, with buildings lining both sides. From Rue de la Madeleine, its curved path climbed steeply to Place des Bailles, which preceded the old Ducal Palace and was replaced in 1776-1781 by Place Royale. In the 19th century , its reputation was primarily commercial.The current appearance of the street is the result of the demolition of blocks of houses, in several phases since the end of the last century. From the middle of the 19th century , various projects were proposed to improve the connection between the upper town and the lower town, involving the redevelopment of the Montagne de la Cour carried out in tandem with the sanitation of the Saint-Roch district and, since the end of the 19th century , the enlargement and clearing of the Museum of Fine Arts, including those of the architects H. Maquet in 1876 and A. Balat in 1882, reworked by Maquet in 1898 . When the Saint-Roch district was demolished and the Coudenberg was created in 1897-1899, the northern alignment of the rue Montagne de la Cour almost entirely disappeared.