Following the Norman Conquest the area around Chrishall was given to Eustace of Boulogne who built and occupied a house on a hill to the south of the current church.
Eustace III, Count of Boulogne, count of Boulogne, son of Eustace II of Boulogne and Ida of Lorraine
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On his death the county of Boulogne was inherited by his daughter, Matilda, and her husband Stephen de Blois, count of Mortain, afterwards king of England, and at the death of Matilda in 1152 it was inherited by their son, Eustace IV of Boulogne, later their second son William and ultimately by their daughter Marie of Boulogne, since both sons died without children.
She outlived Madeleine by five years but died childless, after which the Counties of Auvergne and Boulogne as well as the barony of La Tour passed to Madeleine's daughter Catherine de' Medici and then to the French Crown.
Marie I or Mary (1136 – 25 July 1182 in St Austrebert, Montreuil, France) was the suo jure Countess of Boulogne from 1159 to 1170.
The Young King and his French mentor created a wide alliance against Henry II by promising land and revenues in England and Anjou to the Counts of Flanders, Boulogne, and Blois.