The Bohuns came into England at, or shortly after, the Norman Conquest; but their early history there is obscure.
The lands of the family lay chiefly on the Welsh Marches, and from this date the Bohuns take a foremost place among the Marcher barons.
With him, as with his father, the politics of the Marches had been the main consideration; his final change of side was due to jealousy of the younger Despenser, whose lordship of Glamorgan was too great for the comfort of the Bohuns in Brecon.
The three earldoms and the broad lands of the Bohuns were divided between two co-heiresses.
Franco de Bohun inherited Midhurst from his uncle Savaric Fitz-Savaric, and the De Bohuns held the lordship until 1499 when Sir David Owen obtained it through his marriage with the daughter of the last male heir.
In time a town grew up outside the castle, and its inhabitants received a series of charters from the de Bohuns, into which family the castle and lordship passed, the earliest recorded charter being granted by Humphrey, 3rd earl of Hereford.
The latter, round which the town probably grew up, is said to have been built by the de Bohuns, who obtained possession of the manor by marriage with the daughter of Edward de Sarisbury.