Does the hypothesis 'At the western end of Cowgate (where it meets Holyrood Road), you will see one of the few remaining sections of Edinburgh's old city wall (Flodden Wall), built following the Lang Siege of the 1570s.' logically conflict with the premise 'Flodden Wall was built in the late 18th century.'
At the western end of Cowgate (where it meets Holyrood Road), you will see one of the few remaining sections of Edinburgh's old city wall (Flodden Wall), built following the Lang Siege of the 1570s.###Flodden Wall was built in the late 18th century.