Needing more support, Ermengard took Louis to the court of Charles the Fat, her first cousin once-removed, a great-grandson of Charlemagne, and emperor of the Carolingian Empire at the time. Charles recognized Louis as the rightful ruler after his father, adopted him as his own son, and promised Louis and Ermengard his protection.
Less than a year later, Charles was dead. Ermengard brought Louis to his successor, Arnulf of Carinthia, who had succeeded his uncle Charles. She wanted to make sure the child Louis would be protected in his birthright. She also requested help from Pope Stephen V.
In August 890, a council of bishops and noble vassals proclaimed Louis the rightful king of Arles, Provence, and Lower Burgundy (below the Rhine Valley). They were inspired to do so by the recommendation of the pope and by Charles the Fat's long-ago support.
In 896, now 16 years old, Louis waged war on Saracen pirates who had been raiding the coast of Provence since 889. In 900, hje was asked to come with military support to Italy where he overthrew King Berengar I of Italy. Louis went to Pavia and was crowned with the Iron Crown of Lombardy. He then descended to Rome where Pope Benedict IV crowned him Emperor of Italy. (He was, after all, the grandson of Louis II, former emperor, through Ermengard.) Unfortunately, Berengar returned and defeated Louis' armies, forcing him out of Italy, making him promise that he would never return to Italy.
In 899, a plan to unite with the Byzantine empire to fight Saracens led to Louis being betrothed to Anna of Constantinople, daughter of Emperor Leo the Wise and his second wife, Zoe. A letter of the Patriarch Nicholas Mystikos mentions Leo's daughter being allied with a Frankish prince. There is no evidence that the two ever met, and certainly no wedding took place. Louis did father a son, Charles-Constantine, but no mother is named in any documents. The second half of the name does suggest, however, that the son (who later became Count of Vienne) was a uniting of the two empires. On the other hand, no contemporary Byzantine chroniclers make any mention of a marriage of an emperor's daughter.
In 905 he made another attempt (with local Italian support) to oust Berengar. He succeeded, again, but only temporarily. Going to Verona, he was ambushed by Berengar loyalists and captured. For breaking his oath and returning to Italy, Berengar had Louis blinded.
I have left out a part of Louis III's younger days, because I'm saving it for tomorrow, when I'm going to tell you about Richard the Justiciar, who was mentioned above and who was terrible to Louis.
