What was the date of the canonization of Saint Winifred of Wales?

Saint Winifred died in AD 660. At that time, the Catholic Church had no formal procedures for canonization. A person was simply acknowledged to be a saint based on their reputation in the community and from evidence of miracles. This is what occurred with respect to Saint Winifred who was known for her virginity, martyrdom, being miraculously raised from the dead, founding an abbey or two, and a long line of miracles at Holywell.