Detailed Instructions: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Problem:Context: In 985 Otto III appointed him to succeed Margrave Rikdag in Meissen, following severe Saxon setbacks against the Slavic Lutici tribes during the Great Slav Rising Link Information: The Great Slav Rising in 983 was an uprising of the Polabian Slavs (Wends), mainly Lutici and Obotrite tribes living east of the Elbe River in modern north-east Germany. Question: How long had the Great Slav Rising been occurring when Otto III appointed Eckard I, Margrave of Meissen to succeed Margrave Rikdag?
Solution:
Answer: 2