This grand boulevard was built to replace the city walls, which had been built during the 13th century and funded by the ransom payment derived from the release of Richard the Lion Heart, Richard I of England, and reinforced as a consequence of the First Turkish Siege in 1529 and the Thirty Years' War in 1618. The walls were surrounded by a glacis about 500m wide, where buildings and vegetation were prohibited for military defensive reason. But by the late 18th century these fortifications had become obsolete. Under Emperor Joseph II, streets and walkways were built in the glacis, lit by lanterns and lined by trees. Craftsmen built open-air workshops, and stalls were set up. But the Revolution of 1848 was required to trigger a more significant change.