The Cluniac Order was a reforming offshoot of the Order of St Benedict founded in Italy in 529 AD. The first monastery was Cluny Abbey founded in 910 AD by William I, Count of Auvergne. The monks lived by the Rule of St Benedict. There were over 1000 dependent houses in Europe which were organised into 10 provinces: 1 Lyon; 2 France; 3 Provence, Tarentaise, Dauphiné, Vienne; 4 Poitou, Saintonge; 5 Auvergne; 6 Gascogne; 7 Germany, 8 Italy, 9 Spain, 10 England & Scotland.
Over the mediaeval period there were 50 Cluniac foundations in UK.
Read the article on the Dependencies of Lewes Priory.