Louis IV (September 920/921 – 10 September 954), called d'Outremer or Transmarinus (both meaning "from overseas"), reigned as King of West Francia from 936 to 954. A member of the Carolingian dynasty, he was the only son of king Charles the Simple and his second wife Eadgifu of Wessex, daughter of King Edward the Elder of Wessex. His reign is mostly known thanks to the Annals of Flodoard and the later Historiae of Richerus. Childhood Louis was born to King Charles III and his 2nd wife Eadgifu, in the heartlands of West Francia's Carolingian lands between Laon and Reims in 920 or 921. He was descended both from Charlemagne and King Alfred the Great. From his father's first marriage with Frederuna (d. 917) he had six older half-sisters. After the dethronement and capture of Charles the Simple in 923, following his defeat at the Battle of Soissons, queen Eadgifu and her infant son took refuge in Wessex (for this he received the nickname of d'Outremer) at the court of her father King Edward, and after Edward's death, of her brother King Æthelstan. Young Louis was raised in the Anglo-Saxon court until his teens. During this time he enjoyed legendary stories about Edmund the Martyr (king of East Anglia), an ancestor of his maternal family who had heroically fought against the Vikings.

From Wikipedia (CC BY-SA 4.0).

Louis IV (September 920/921 – 10 September 954), called d'Outremer or Transmarinus (both meaning "from overseas"), reigned as King of West Francia from 936 to 954. A member of the Carolingian dynasty, he was the only son of king Charles the Simple and his second wife Eadgifu of Wessex, daughter of King Edward the Elder of Wessex. His reign is mostly known thanks to the Annals of Flodoard and the later Historiae of Richerus.