 During the 12th century the planned town of Ludlow was formed, in stages, the town providing a useful source of income for successive Marcher Lords, based on rents, fines, and tolls.They developed the town on a regular grid pattern, although this was adapted somewhat to match the local topography, from the late 11th century through the 12th century.The first laid street was along the ridge of the hilltop, what is now Castle Square, High Street and King Street.