For 10 points, name this mythology that has four cycles, including the Ulster and Fenian, whose characters include Finn Mac Cool and the Fianna.
One story in this myth system tells of a hero's journey to the Isle of Joy, which unexpectedly lasts for hundreds of years. A god of this mythology owned a cauldron that left everyone satisfied and a club that could both kill and revive. In this belief system, the love god Angus was conceived and born on the same day. This myth system includes the leader of the Tuatha De Danaan, the Daghda. For 10 points, name this mythology that has four cycles, including the Ulster and Fenian, whose characters include Finn Mac Cool and the Fianna.
One story in this myth system tells of a hero's journey to the Isle of Joy, which unexpectedly lasts for hundreds of years.
Celtic mythology [or Irish mythology; accept word forms; do not accept "Welsh myth" or "Wales"]