In 1326, Otto I and Adelheid visited Pope John XXII in Avignon with a large retinue.

The Pope promised Louis a prebendary if he remained celibate.

In 1328, Otto I died and his elder brother Henry II inherited the Landgraviate.

Louis received an apanage, consisting of castle and district of Grebenstein.

On 15 October 1340, Louis married Elisabeth (or Elise), a daughter of Count Simon II of Sponheim-Kreuznach.