Murage was a medieval toll for the building or repair of town walls in England and Wales. Additional comment: The term `murage`, while having this specific meaning could also refer to other aid for walls or to the walls themselves. It generally is applied to defensive towns walls but can also refer to flood defences and sea walls. The tax was ta.....
tax for the upkeep of walls
• (n.) A tax or toll paid for building or repairing the walls of a fortified town.
tax levied by boroughs to pay for the building of town walls
Medieval tax for the upkeep of a town's defensive walls and gates. ...
Mu'rage noun [ French, from murer to wall, from mur wall, Latin murus . See Mure a wall.] A tax or toll paid for building or repairing the walls of a fortified town. 
a toll or tax for the repair or construction of the walls or fortifications of a town.