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'.

Context: Dal Riata is said to have been founded by the legendary king Fergus Mor (Fergus the Great) in the 5th century. The kingdom reached its height under Aedan mac Gabrain (). Link Information: none Question: How many years after it was founded did Aedan mac Gabrain rule Dal Riata?
Answer: none