After they had travelled for some time, their druids[3] told them that it was not fated for them to settle in the same place; and accordingly, when they had come to the Pass of the two Pillar Stones, they parted. Rib and his people turned to the west, and they journeyed till they came to the plain of Arbthenn. And there the water of a fountain burst forth over the land, and drowned them all; and a great lake was formed, which to this day is called the Lake of Rib.[LIX.] Ecca continued his journey northwards; and he and his people fared slowly on till they came near to Bruga[LX.] of the Boyne, the palace of Mac Indoc, where they were fain to rest. No sooner had they halted, than a tall man came forth from the palace, namely, Angus Mac Indoc of the Bruga, son of the Dagda, and commanded them to leave the place without delay. But they, being spent with the toil of travel, heeded not his words, and, pitching their tents, they rested on the plain before the palace. Whereupon Angus, being wroth that his commands were unheeded, killed all their horses that night. Next day, he came forth again, and he said to them, "Your horses I slew last night; and now, unless ye depart from this place, I will slay your people to-night." And Ecca said to him, "Much evil hast thou done to us already, for thou hast killed all our horses. And now we cannot go, even though we desire it, for without horses we cannot travel." Then Angus brought to them a very large horse in full harness, and they put all their goods on him. And when they were about to go, he said to them-- "Beware that ye keep this great steed walking continually; not even a moment's rest shall ye give him, otherwise he will certainly be the cause of your death."[14] After this they set out again, on a Sunday in the mid-month of autumn, and travelled on till they reached the Plain of the Grey Copse,[LXI.] where they intended to abide. They gathered then round the great steed to take their luggage off him, and each was busy seeing after his own property, so that they forgot to keep the horse moving. And the moment he stood still, a magic well sprang up beneath his feet.[14] Now Ecca, when he saw the well spring up, was troubled, remembering Angus's warning. And he caused a house to be built round it, and near it he built his palace, for the better security. And he chose a woman to take care of the well, charging her strictly to keep the door locked, except when the people of the palace came for water. After that the King of Ulad,[LXII.] that is to say, Muridach, the son of Fiaca Findamnas (who was grandson of Conal Carna of the Red Branch[15]) came against Ecca to drive him forth from Ulad. But Ecca made a stout fight, so that he won the lordship of half of Ulad from Muridach. And after that his people settled down on the Plain of the Grey Copse.