Eustace IV, Count of Boulogne Eustace IV, Count of Boulogne Eustace IV (c. 1127–1135 – 17 August 1153), Count of Boulogne, was the eldest son of King Stephen of England and Countess Matilda I of Boulogne. When his father seized the English throne on Henry I's death in 1135, he became heir apparent to the English throne. Upon his mother's death in 1152 he inherited the county of Boulogne and other estates. Eustace was first mentioned in one of his parents' charters dated no later than August 1131. As heir to the English throne in 1137, he did homage for Normandy to Louis VII of
Henry V, Count Palatine of the Rhine Brittany in April 1203, Henry effectively became the heir of his maternal uncle John Lackland to the English throne, this ended though when John's son (the future king Henry III) was born in October 1207. After he inherited further significant properties in Saxony from his brother William in 1213, Henry ceded the Palatinate to his son Henry the Younger and moved north. After his son's early death the next year, he left his Welf properties to his nephew, William's son Otto the Child, who became the first Duke of Brunswick-Lüneburg in 1235. Henry died in 1227 and is entombed in