Finally, he did escape and went to Britain. And then to France. There he joined a monastery and studied under St. Germain, the bishop of Auxerre. He spent around 12 years in training. And when he became a bishop he dreamed that the Irish were calling him back to Ireland to tell them about God.

For 20 years he had traveled throughout Ireland, establishing monasteries across the country. He also set up schools and churches which would aid him in his conversion.

It is said that he used the three-leafed shamrock to explain the concept of the Trinity; which refers to the combination of Father, Son, and the Holy Spirit. Legend also has that,Saint Patrick had put the curse of God on venomous snakes in Ireland.
And he drove all the snakes into the sea where they drowned.

Meanwhile the city of Chicago has developed a unique tradition of coloring the river water green. 40 pounds of a green food coloring keep the river green for only a few hours.