Given the task definition and input, reply with output. 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: the reconquest of Portus Cale (Porto) by Vimara Peres in 868 Link Information: Vimara was a vassal of the King of Asturias, Alfonso III, and was sent to reconquer and secure from the Moors (Arabs and Berbers who had invaded Visigothic Hispania), in the west coastal fringe of Gallaecia, the area from the Minho River to the Douro River, including the city of Portus Cale Question: What military rank did Vimara Peres hold the year he reconquered Portus Cale?
Answer: vassal