On Easter-eve, S. Patrick arrived at Slane. He pitched his tent, and made preparations for celebrating the festival of Easter, and accordingly lighted the Paschal fire about night-fall. It happened that at this very time the king Leogaire (Lear) and the assembled princes were celebrating a religious festival in honour of the return of the sun to power and heat. Part of the ritual of this festival consisted in every fire being extinguished for some days previous, that all might be relighted from the sacred fire in the palace or temple of Temora, on Tarah hill, which was kindled on a certain day, now near at hand. Twilight had settled over the great plain, and all men waited for the red flame to shoot up on Tarah hill, a signal that the festival was begun, and that all might rekindle their hearth fires from the consecrated blaze. But a spark shone out far away on the plain, from the tent of Patrick, and consternation at this sacrilege and infringement of precedent became general. The king at once galloped to Slane, followed by a crowd, and accompanied by two priests, who assured him that unless this fire were extinguished, it would overpower their fires, and bring the kingdom to its downfall. On arriving within a short distance of the tent and fire, the king dismounted, seated himself, ordered his followers to seat themselves, and not to rise or show any respect to the violator of their laws, and then ordered Patrick to be brought before him. On his presenting himself, one alone rose and saluted him, breaking the king's command; this was the little lad Herc, son of Drogo, and the saint thereupon blessed him. He was afterwards bishop of Slane, and celebrated for his sanctity. He was ordered to declare his object in coming to Ireland, and contend with the wise men, or priests, next day. On Easter-day, therefore, he preached before the king and his nobles, and strove with the captious objections of the Wise-men. It was then, probably, when explaining the mystery of the Trinity, and when questioned as to the triple Personality of the One God, that he stooped and plucked a shamrock, and exhibited it as a symbol of the Catholic doctrine of the Triune God.[58]