Despite the title's permanent union with that of King of the Romans, the Arelat was considered for reconstitution several times. The most serious of these was under Pope Nicholas III and sponsored by Charles of Anjou: as part of the deals and truces taken place between 1277 and 1279 between Charles, who at that time was already King of Naples, Rudolf of Habsburg, King of the Romans and aspirant to the Imperial crown, and Margaret of Provence, the Queen-Mother of France, over the conflict of jurisdictions and succession for the County of Provence, as well as the chain of favors exploited by Rudolf to become the sole Imperial candidate. In the agreement, Nicholas III managed to settle Rudolf to give up the whole Arelat to Charles's grandson Charles Martel of Anjou as a dowry for marrying his daughter Klementia von Habsburg, in exchange for hereditary rights to the Kingdom of Germany for him and his successors. Likewise, Nicholas expected Northern Italy to become a kingdom carved out of the Imperial territory and be given to his family, the Orsini. In 1282, Charles was ready to send the child couple to reclaim the old royal title of Kings of Arles, but the War of the Sicilan Vespers frustrated his plans, as well as his planned invasion of the Byzantine Empire.
What if Charles Martel gained the Kingdom of Arles?
http://en.wikipedia.org/wiki/Kingdom_of_Arles#cite_note-2
What if Charles Martel gained the Kingdom of Arles?
http://en.wikipedia.org/wiki/Kingdom_of_Arles#cite_note-2