Idoine (or Idonea) de Camville was born c. 1209 in Brattleby, Lincolnshire, the only daughter and heir to Richard de Camville, who in turn was the only son and heir of Gerard de Camville and Nicola de la Haye, holders of the castellanship of Lincoln Castle.

The de Camville family came to England with William the Conqueror in 1066 and until the loss of Normandy in King John's reign still held Canville-les-Deux-Eglises, from which they took their name. Richard de Camville's largest estate, and what is believed to be the head or caput of his Barony, was at Middleton Stoney in Oxfordshire although he also held in chief Avington in Berkshire and Godington in Oxfordshire. In 1215 Idoine's mother died and her father sided with the barons in the civil war, despite her grandparent's long standing allegiance to King John. The year after Magna Carta was signed her father had his lands seized by the crown and the castle at Middleton Stoney was destroyed on the King's orders.

Idoine was taken into Royal custody in Corfe Castle where her wardship was sold by the King to William Longespée, Earl of Salisbury. It was arranged that she should be married to his son William Longsword who, like Idoine, was still a child at the time. With her wardship William Longespée obtained the custody of all the lands which belonged to Idoine by right of her mother Eustachia, the daughter of Gilbert Basset, Lord of Bicester.

She had married William Longsword and attained her majority before June 1226, when the King returned to them the lands of Richard de Camville, who we assume by this time had died. This meant that the lands inherited by Idoine from the Basset, de la Haye and de Camville families were now in the hands of the Longespées, making it a very profitable marriage for William. It is believed that they may have had four children (William, Richard, Ela and Ida), although the only ones well recorded are William and Ela.  Idoine died c. 1251, a couple of years after her husband's death at the Battle of Mansor.