I of Scotland invaded the north on the news of Henry's death, taking Carlisle, Newcastle and other key strongholds. Northern England was a disputed territory at this time, with the Scottish kings laying a traditional claim to Cumberland, and David also claiming Northumbria by virtue of his marriage to the daughter of Waltheof, Earl of Northumbria. Stephen rapidly marched north with an army and met David at Durham. An agreement was made under which David would return most of the territory he had taken, with the exception of Carlisle. In return, Stephen confirmed the English possessions of David's son Henry, including the Earldom of Huntingdon. Returning south, Stephen held his first royal court at Easter 1136. A wide range of nobles gathered at Westminster for the event, including many of the Anglo-Norman barons and most of the higher officials of the church. Stephen issued a new royal charter, confirming the promises he had made to the church, promising to reverse Henry I's policies on the royal forests and to reform any abuses of the royal legal system. He portrayed himself as the natural successor to Henry's policies, and reconfirmed the existing seven earldoms in the kingdom on their existing holders. The Easter court was a lavish event, and a large amount of money was spent on the event itself, clothes and gifts. Stephen gave out grants of land and favours to those present and endowed numerous church foundations with land and privileges. His accession to the throne still needed to be ratified by the Pope, however, and Henry of Blois appears to have been responsible for ensuring that testimonials of support were sent both from Stephen's brother Theobald and from the French king Louis VI, to whom Stephen represented a useful balance to Angevin power in the north of France. Pope Innocent II confirmed Stephen as king by letter later that year, and Stephen's advisers circulated copies widely around England to demonstrate his legitimacy. Troubles continued across Stephen's kingdom. After the Welsh victory at the battle of Llwchwr in January 1136 and the successful ambush of Richard Fitz Gilbert de Clare in April, south Wales rose in rebellion, starting in east Glamorgan and rapidly spreading across the rest of south Wales during 1137. Owain Gwynedd and Gruffydd ap Rhys successfully captured considerable territories, including Carmarthen Castle. Stephen responded by sending Richard's brother Baldwin and the Marcher Lord Robert Fitz Harold