The Chief-King of Erin (as Ireland was called) was just going to hold his solemn festival at Tara. All the Irish princes and all the priests of the pagan religion had collected together. One of their ceremonies was the lighting of fire at dawn, with magic rites and ceremonies. It happened to be Holy Saturday, and on that day the Christians used to light a beacon. St. Patrick lit his holy fire, as usual. The King saw it blazing on a hill-top, and was very angry. One of his priests (or Druids, as they were called) said: "If that fire is not put out before morning, it never will be put out," and he meant the Christian Faith. So the King sent for St. Patrick.

Surrounded by his Druids and bards, and all the Irish princes, the King sat, fierce and proud, and awaited the strangers. It was Easter morning, so, as St. Patrick and his little band advanced, they chanted the Easter litanies. So noble and holy did St. Patrick look that one of the bards rose as he drew near. This little act of politeness on the part of the bard brought him special grace from heaven, and he accepted the Christian Faith.

Standing quietly in the midst of the circle of priests and princes, St. Patrick looked around him. He met countless pairs of fierce eyes fixed upon him, as the princes sat in silence, "with the rims of their shields against their chins"; and as he looked at them he longed to win them all for God, and he prayed for grace and power to do what was needed. Then he told them why he had come to Ireland.

The King left his Druids to reply. They did so by doing all sorts of horrible magic. And certainly they made things happen, much as people called "spiritists" do nowadays; but it was not by God's power, so it must have been the Devil who helped them. Whatever the Druids did, St. Patrick undid, and then did something more wonderful. The Druids were furious, and no one knows what might have happened had not St. Patrick caused an earthquake to happen, by God's power. So terrified were the Irish that they went half mad and began killing each other, and St. Patrick and his men escaped.

But the next day St. Patrick boldly came back, though he knew the King meant to kill him. He was given a cup of poisoned wine to drink. Well, what of that? Did not Our Lord say to His disciples, when He sent them out to convert the world, "If you drink any deadly thing it shall not hurt you"? St. Patrick made the sign of the cross over the cup and drank it, and nothing happened.

Then the Druids arranged a horrible test. They laid two great fires, one of dry faggots and the other of wet, green wood. On the dry wood they laid the boy Benignus, dressed in a Druid's white robe. On the green they put a Druid, clad in St. Patrick's cloak. Then they said they would set fire to both piles. St. Patrick accepted the challenge. (If you had been the boy, would you have "got the wind up," do you think, or would you have trusted St. Patrick?)

Well, they set fire to the two piles of wood. Strange to say, the green wood blazed up, with many sizzlings and cracklings and much smoke, but the dry wood simply wouldn't light. There was, however, a sudden flame, and the Druid's robe on the boy flared up and was soon burnt to ashes, leaving Benignus quite all right, and, I expect, very pleased with himself! Meanwhile, horrible noises had been coming from the other pile, and when the smoke and flames died down there were only charred cinders where there had once been a Druid. But St. Patrick's cloak had not been burnt at all.

As the King still would not believe, St. Patrick had to make another earthquake happen, which swallowed up so many of the King's subjects that he gave in, and said St. Patrick might preach, though he himself never accepted the Faith.

So, on the green plains of Tara, St. Patrick preached a wonderful sermon to the Irish, who by this time had come crowding round to see the stranger who could beat the Druids at their own game. During this sermon St. Patrick stooped down and picked a leaf of shamrock, and, holding it up, showed the people how the little green leaf was three and yet one. He said that would help them to understand how the Blessed Trinity is three—God the Father, God the Son, and God the Holy Ghost—and yet is really only one God. That is why the Irish wear shamrock on St. Patrick's Day (March 17th).