 The wardens recognised special border tenant rights, in return for the supply of military service.The border 'names' (magnates) and lesser families indulged in warfare and raiding across the border, the lesser brigands often receiving protection from the greater lords.As a consequence, throughout the 14th-century, there was an increase in the building of castles by the greater magnates, and in the building of fortified houses (peel towers, mostly built during c.1350–1600; semi-fortified houses, c.1400–1600; and bastle houses, mostly built c.1540–1640) by the lesser families.