John I, Count of Ponthieu

John I of Ponthieu (c. 1140 – 1191) was the son of Guy II of Ponthieu and Ida.^[1] He succeeded his father as Count of Ponthieu in 1147.^[2]

War with Normandy

John attacked Normandy in 1166 and 1168,^[3] in response to King Henry II of England's confiscation of the castles at Alençon, La Roche-Mabile and the Alenconnais.^[4] Henry, angry with John's rebellion, led his army on a path of destruction across Vimeu, the south-west part of Ponthieu.^[5]

Family

John married Beatrice of Saint-Pol,^[1] they had:

• William IV Talvas^[6]
• Margaret, married a Pecquigny^[6]

References

1. Tanner 2004, p. 295.
2. Holt 1985, p. 61.
3. Power 2014, p. 154.
4. Power 2004, p. 397-398.
5. Power 2004, p. 398.
6. Parsons 1977, p. 51.

Sources

• Holt, James Clarke (1985). Magna Carta and Medieval Government. Hambledon Press.
• Parsons, John Carmi (1977). The Court and Household of Eleanor of Castile in 1290. Pontifical Institute of Mediaeval Studies.
• Power, Daniel (2004). The Norman Frontier in the Twelfth and Early Thirteenth Centuries. Cambridge University Press.
• Power, Daniel (2014). "The Preparations of Count John I of Sees for the Third Crusade". In Morton, Nicholas; John, Simon (eds.). Crusading and Warfare in the Middle Ages. Ashgate Publishing Limited.
• Tanner, Heather (2004). Families, Friends and Allies: Boulogne and Politics in Northern France and England, c.879-1160. Brill.