Who was Saint Patrick sold to?

Maewyn Succat (now called Patrick) was sold to a pagan Druid chieftan who put him to work herding sheep.

In his sixteenth year, Patrick was carried off into captivity by Irish marauders and was sold as a slave to a chieftan named Milchu in Dalriada, a territory of the present county of Antrim in Ireland, where for six years he tended his master's flocks in the valley of the Braid and on the slopes of Slemish, near the modern town of Ballymena.