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Why did the united kingdom of Burgundy become known as the kingdom of Arles?

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Map of France highlighting the Burgundy (Bourgogne) region in white at the center-east of the country, with major cities such as Dijon, Nevers, Auxerre, and Macon labeled. Surrounding countries and bodies of water, including Belgium, Germany, Switzerland, Italy, Spain, the Atlantic Ocean, and the Mediterranean Sea, are also shown. An inset map in the upper left corner shows the location of Burgundy within France. — Burgundy Burgundy (Bourgogne), historical region of France.

The united kingdom of Burgundy became known as the kingdom of Arles starting in the 13th century. This renaming occurred following the 1032 bequest of the unified Upper and Lower Burgundy to the German king and emperor Conrad II.1

The shift in nomenclature served to distinguish this territory from other regions that also carried the name Burgundy, specifically the duchy of Burgundy and the county of Burgundy (Cisjurane Burgundy). By adopting the name of the city of Arles—which had served as the kingdom's capital in the 10th century—the title helped clarify the geographic and political identity of the former regnum Burgundiae as it evolved within the Holy Roman Empire.12