What did st columba achieve?

St. Columba, an Irish monk and missionary, is best known for founding the monastic community on the island of Iona in Scotland around 563 AD, which became a center for Christianity in the region. He played a crucial role in spreading Christianity among the Picts and played a significant part in the conversion of the Scottish people. Additionally, Columba is credited with promoting education and the establishment of monasteries, contributing to the cultural and spiritual landscape of early medieval Scotland. His legacy includes numerous writings and the influence of Celtic Christianity.