Three brothers from the Imatzenea hamlet went up the mountain with their sheep on Good Friday, to the sheep fold of Ubegi. In the vicinity of the cave of Ubegi, three mythological bulls (zezengorri) came out of the cave and headed towards them.
The three brothers, frightened, fled to the top Agautz with the mythological bulls behind them. One of the brothers died on the path of Aldatsa de Agautz; the second in the area of Erremedy; and the third managed to get home but died a few days later.