Instructions: Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
Input: Context: Traidenis (Polish: Trojden, Belarusian: ) (died 1282) was the Grand Duke of Lithuania from 1270 (or 1269) till 1282.
Question: What noble title does Traidenis hold?
Output:
grand duke of lithuania