Rudolph, Count of Ponthieu

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Count Rudolph (or Rudolf) of Ponthieu (died 866) was a son of Welf (also Hwelf or Welf I) by Hedwig of Bavaria, and thus a brother of Judith of Bavaria, wife of Emperor Louis the Pious. Through Judith's influence, her brother Rudolph acquired and became Lay Abbot of the Abbeys of Saint Riquier and Jumieges.

In April 830, Frankish nobility revolted against Emperor Louis in order to "liberate" him from the influence of his wife Judith. Louis was placed under house arrest, whilst Judith and her brothers Rudolph and Conrad I, Count of Auxerre, were imprisoned in Aquitanian monasteries. The two brothers were later freed when their nephew Charles the Bald assumed the throne.

Rudolph was married to Hruodun (died 867), who bore him:

• Conrad, Count of Paris and Sens (died 882)
• Welf, Abbot of Sainte-Colombe-de-Sens
• Hugh
• Rudolf, Duke of Rhaetia

• The Carolingians, A family who forged Europe by Pierre Riche (translated by Michael Idomir Allen), University of Philadelphia Press, 1993
• I Conti de' Marsi e la loro discendenze fino alla fondazione dell'Aquila by Cesare Rivera, Teramo, 1915