Peel towers (also spelt pele) are small fortified keeps or tower houses, built along the English and Scottish borders in the Scottish Marches and North of England, mainly between the mid-14th century and about 1600. They were free-standing with defence being a prime consideration of their design with "confirmation of status and prestige" also playing a role. They also functioned as watch towers where signal fires could be lit by the garrison to warn of approaching danger.