He was only three years old when his mother took him "over the sea" (in French, outremer) to the safety of England after his father was imprisoned. Hence the nickname.
On the death of his father in 936, Louis was summoned back to France and crowned king. Effectively, his sovereignty was limited to the town of Laon and to some places in the north of France, Louis displayed a keenness beyond his years in obtaining the recognition of his authority by his feuding nobles. Nonetheless, his reign was filled with conflict in particular with Hugh the Great, count of Paris.
In 939 Louis became involved in a struggle with the Emperor Otto the Great on the question of Lorraine, but then married Otto's sister Gerberge (914–May 5, 984), Princess of Germany and they had two sons and a daughter:
On the death of the usurper Rudolph (Raoul), Ralph of Burgundy, Hugh the Great, count of Paris, and the other nobles between whom France was divided, chose Louis for their king, and the lad was brought over from England and consecrated at Laon on the 19th of June 936.
In 939Louis became involved in a struggle with the emperor Otto the Great on the question of Lorraine, the nobles of which district had sworn an oath of fidelity to the king of France.
Louis died on the 10th of September 954, and was succeeded by his son Lothair.