How did the French king Louis IV become involved in the revolt against Otto I?

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Stone sculptures of Otto I and his wife Edith, both crowned and seated, displayed side by side in the cathedral at Magdeburg, Germany. — Otto I Otto I and his wife Edith, sculptures in the cathedral at Magdeburg, Germany.

The French king Louis IV became involved in the revolt against Otto I in 939 by supporting Otto's younger brother, Henry, and other rebellious nobles, including Eberhard of Franconia and Giselbert of Lotharingia.1

This involvement was part of a broader conflict regarding territorial claims and power struggles. Louis IV had previously interfered in the affairs of Lotharingia, which prompted Otto I to retaliate by sending aid to the rebels who were attacking Louis in France. Following the defeat of the rebels by Otto I, Louis eventually made peace with the German king in 942.2