This cycle has to do with the otherworld characters.  This theme is more to do with the succesive invasion of Ireland by supernatural clans.  This is called Lebor Gabala or Book of Invasions.  The early supernatural inhagitants of Ireland included the Partholonians, the Nemedians, The demonic Forhoire and the Fir Bholg, and the Tuatha De Danann, then followed by the Milesians.
The Milesians was led by the sons of Mill, they were the first human ancestors of the Irish.  They defeated the Tuatha.  After the defeat, Ireland was in their posession.  They then formed it into 2 parts, one  the Eireamhoin ruling in the north and eht Eibhear in the south.
After the Tuatha returned to Tir Nan Og beneath the hollow hills.
The main thing of this cycle was hunting.  The Fenians, or Fianna were legendary clan of heroes who defended Ireland and Scotland and kept "law and order".
The leader was the Fionn Mac Cumhaill Fionn was the wisest and kindest of his clan, he had 2 sons, Fergus of the sweet speech, and Ossian or Oisin, who is credited with a series of poems known as "Ossianic Ballads".
Caolite a great warrior was Fionn's handy man, and he is known to have extolled the virtues of the Fianna when he conversed with St. Patrick in the Dialogue of the Elders.
Other known Fenians were Oscar the greatest warrior, Conana, Goll Mac Morna, and Diarmait O'Duibhne who wed Grania.
A large amout of tales revolve around that of the Ulaidh, the ancient people whom the province of Ulster got its name.
The central cycle is called Tain Bo Cuailnge, the cattle raid of Cooley.  Queen Medb and Cuchulainn was Ulsters greatest heroes.
This cycle deals with the curse of Ulster, the Reign of Conchobor Mac Nesa, and king of Ulster at Emain Macha, and the battles of the other 3 Irish provinces Connaht, Leinster, and Munster.
It probably came about the late Le Tene period, or the 3rd century.
This was the tale of the kings of Ireland,  generally from Ad to the middle ages.  Many of them have already appeared in past cycles, around the 12th century the tales of sagas of Ireland were categorized as either Prem-Sceil "Chief tales" or Fo-Sceil "minor tales".
Mabinogian Cycle
(Fairy Cycle
This cycle consisted of the Druids in the Pagan iron age, until the Roman conquest of Britain.  The stories wandered about thru story tellers, until about the 13tha dn 14th centuary when the Chistian Monks  wrote down what was left of the tales.  They wrote them in documents such as Peniarth manuscripts and the White book of Rhyddersch, the Red book of Hergest. They were then published by Lady Charlotte Guest.
The 7 tales consisted of: (1) British kings, warriors and Wizards.  (2) Arthurian myths *there were 4 tales in this series* and the  3rd was about Arthurian romances. *3 tales in this series*
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