Clermont-en-Beauvaisis, which is ESE of Beauvais and north of Paris, was the capital of a French County from the 11th century. It lay in the east of the pays of Beauvaisis, the greater part of which formed a County for the Bishop of Beauvais. The last Count of the original line died as Constable of France on Crusade in 1191 and was succeeded by his son-in-law, Louis, Count of Blois, though cadet lines of the House of Clermont remained amongst the important nobility of medieval France. There were only two Blois Counts, Thibaut VI dying in 1218 when still young.
The County was bought by King Philip II and given to Philip Hurepel, his son by his canonically dubious third marriage to Agnes of Meran. In 1258 Louis IX acquired the County, which had been held by Philip Hurepel’s heiress, and in 1269 he granted it to his youngest son, Robert, the husband of the heiress to Bourbon.
In 1327 Robert’s son, Louis I, became Duke of Bourbon, and exchanged the County of Clermont for that of La Marche, which was a neighbour of Bourbon. In 1329 Philip VI, newly succeeded, returned Clermont, to be used as the title for the heir to the Duchy of Bourbon. Apart from a brief occupation by the English, beginning in 1434, when John Talbot became Count, Clermont remained with the Bourbons until the treason of Constable Bourbon in 1523.
The title was held by various members of the Bourbon-Condé family from the 16th to the 19th centuries, including in the late 16th/early 17th centuries the Bourbon-Condé Counts of Soissons. To confuse matters, the Bourbon-Condés also held the title of Count of Clermont-en-Argonne.
Clermont became part of the gouvernement of the Île-de-France, like the rest of the Beauvaisis, but was part of the généralité of Soissons rather than Paris.