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, intended as watch towers where signal fires could be lit by the garrison to warn of approaching danger.
By an Act of the Parliament of England in 1455, each of these towers was required to have an iron basket on its summit and a smoke or fire signal, for day or night use, ready at hand.
A line of these towers was built in the 1430s across the Tweed valley from Berwick to its source, as a response to the dangers of invasion from the Marches. Others were built in Northumberland, Cumberland, Westmorland and North Riding of Yorkshire, and as far south as Lancashire, in response to the threat of attack from the Scots and the Border Reivers of both nationalities.Canons Ashby incorporates one of only a few Peel towers constructed in the Midlands; it owes its existence to the settlement of Cumbrian sheep farmer, John Dryden, in the county of Northamptonshire.
Apart from their primary purpose as a warning system, these towers were also the homes of the lairds and landlords of the area, who dwelt in them with their families and retainers, while their followers lived in simple huts outside the walls. The towers also provided a refuge so that, when cross-border raiding parties arrived, the whole population of a village could take to the tower and wait for the marauders to depart.