The Bonville–Courtenay feud of 1455 engendered a series of raids, sieges, and attacks between two major Devon families, the Courtenays and the Bonvilles, in south west England, in the mid-fifteenth century. One of many such aristocratic feuds of the time, it became entwined with national politics due to the political weight of the protagonists. The Courtenay earls of Devon were the traditional powerbrokers in the region, but by this time a local baronial family, the Bonvilles, had become more powerful and rivalled the Courtenays for royal patronage. Eventually this rivalry spilled over into physical violence, including social disorder, murder, and siege.