A commote (Welsh cwmwd, sometimes spelt in older documents as cymwd, plural cymydau, less frequently cymydoedd), was a secular division of land in Medieval Wales. The word derives from the prefix cym- ("together", "with") and the noun bod ("home, abode"). The English word "commote" is derived from the Middle Welsh cymwt.
The basic unit of land was the tref – a small village or settlement. In theory, 100 trefi made up a cantref (literally, "one hundred settlements"), and half or a third of a cantref was a cymwd, although in practice the actual numbers varied greatly. The plural of cantref is cantrefi. Together with the cantrefi, commotes were the geographical divisions through which defence and justice were organised. In charge of a commote would be a chieftain probably related to the ruling Prince of the Kingdom. His court would have been situated in a special tref, referred to as a maerdref. Here, the bonded villagers who farmed the chieftain's estate lived, together with the court officials and servants. Commotes were further divided into maenorau or maenolydd.
The Domesday Book has entries for those commotes that in 1086 were under Norman control, but still subject to Welsh law and custom. However, it refers to them using the Anglo-Norman word "commot" instead of hundred, the word used at the time for the equivalent land division in England. The commotes mentioned in the Domesday book, in general, represented recent Anglo-Norman advances into Welsh territory. Although the commotes were assessed for military service and taxation, their obligations were rated in carucate (derived from Latin for cattle or oxen), not in hides as on the English side of the border.
The customs of the commotes are described in the Domesday accounts of the border earldoms of Gloucestershire, Herefordshire, Shropshire and Cheshire. The principal commotes described in Domesday were Archenfield, Ewias, and the commotes of Gwent in the south; Cynllaith, Edeirnion, and Iâl (Shropshire accounts); and Englefield, Rhos and Rhufoniog (Cheshire accounts).