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In page Richard I of England:

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Determined to resist Philip's designs on contested Angevin lands such as the Vexin and Berry, Richard poured all his military expertise and vast resources into the war on the French King. He organised an alliance against Philip, including Baldwin IX of Flanders, Renaud, Count of Boulogne, and his father-in-law, King Sancho VI of Navarre, who raided Philip's lands from the south. Most importantly, he managed to secure the Welf inheritance in Saxony for his nephew, Henry the Lion's son, who was elected Otto IV of Germany in 1198.[citation needed]