What is "rikdag"

Rikdag, also called Ricdag, Riddag, or Rihdag (died 985), was Margrave of Meissen from 979 until his death. In 982, he also acquired the marches of Merseburg and Zeitz. After the Great Slav Rising in 983, he temporarily reunited all of the southern marca Geronis under his command. His march included the territory of the Chutizi and Dolomici tribes.