Around 401 AD, a raiding party — traditionally identified as Irish pirates — seized the teenage Patrick from his father's estate in Roman Britain and brought him to Ireland, where he was sold to Miliucc moccu Bain, a chieftain who put him to work as a shepherd on the slopes of Slemish Mountain in what is now County Antrim. Patrick later recorded those six years in his own words in the Confessio, describing them as a period of intense spiritual awakening: cut off from home and family, exposed to the weather day and night, he turned to prayer as his only consolation, sometimes praying hundreds of times a day before sunrise.
The story
According to the tradition, a divine voice came to him in a dream announcing that his ship was ready — a journey of two hundred miles to the coast awaited him. Patrick made his escape, found a vessel, and eventually made his way home to his family. The decisive moment on Slemish, however, planted a love of Ireland he could not shake: years later he returned, now as a bishop, driven by what he described as a vision of the Irish people calling him back.
Slemish today is a distinctive volcanic plug rising sharply above the Antrim Plateau, immediately recognisable from many miles. It has been a site of annual St Patrick's Day pilgrimage for centuries; crowds still hike to the rocky summit on 17 March regardless of weather, making it one of the most tangible and consistently maintained pilgrimage traditions in Northern Ireland. The Confessio of St Patrick, first written in the fifth century, remains the earliest primary source for the legend, lending Slemish an unusually firm documentary foundation.