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Louis IV (September 920 / September 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.

Louis IV (September 10, 920<ref>https://www.findagrave.com/memorial/6240881/louis_iv</ref> – September 10, 954), called d'Outremer or Transmarinus (both meaning "from overseas"), reigned as king of West Francia from 936 to 954, He was a member of the Carolingian dynasty.