The Mythological Cycle [1][2] is a somewhat outdated coined term[3] still used to refer collectively to an ancient literary tradition that concerns the godlike peoples who allegedly arrived in five migratory invasions into Ireland and principally recounts the doings of the Tuatha Dé Danann.[4]
It comprises one of the four major cycles of early Irish literary tradition, the others being the Ulster cycle, the Fenian Cycle and the Cycles of the Kings
References
1) The application of the term seems to have gained currency with Arbois de Jubainville, c. 1881-1883; usage predating this applies the term generally e.g. to Norse mythology, and not specifically to Irish mythology
2) The Irish form Irish: na Scéalta Miotaseolaíochta)focal.ie is even more contrived, since the term has rarely if ever been used in any publication.
3)Mackillop 1998, mythological cycle "Somewhat awkward today, the phrase 'Mythological Cycle' was coined to describe those early stories that, in the absence of a Celtic cosmology, deal most with origins and the discernible remnants of pre-Christian religion; its first usage pre-dates the currency of 'Celtic Mythology'"
4) Mackillop 1998, 'Tuatha Dé Danann' "..principal family of euhemerized pre-Christian Deities".
Source: https://en.wikipedia.org/wiki/Mythological_Cycle
Irish mythology: the Mythological Cycle Index of Names Places and Things:
Supernatural figures>
Tuatha Dé Danann >
Abarta Abcán Abean Aed Aengus Anand Anu Aí Áine Airmed Badb Bec Bé Chuille Bébinn Boann Bodb Derg Bres Brian Brigid Caer Cermait Cian Clídna Credne Dagda Danand Danu Delbáeth Dian Cecht Ecne Elcmar Ernmas Étaín Ethal Ériu-Banba-Fódla Fand Fiacha mac Delbaíth Finnguala Flidais Fuamnach Goibniu Lén Lí Ban Lir Luchta Lug Mac Gréine-Mac Cuill-Mac Cecht Macha Manannán Miach Midir Morrígan Nechtan Neit Nemain Niam Nuada Ogma Tuirenn
Fomhoraigh >
Balor Bres Cethlenn Cichol Conand Elatha Ethniu Tethra
Others >
Achtland Caillech Canola Carman Crob Derg Crom Cruach Donn Mug Ruith Tailtiu Tlachtga Tuan mac Cairill
Settlers >
Cesair Partholón Nemed
Fir Bolg >
Aengus mac Umor Eochaid mac Eirc Fiacha Cennfinnán Fodbgen Gann and Genann Rinnal Rudraige Sengann Sláine Sreng
Milesians >
Amergin Glúingel Breogán Éber Érimón Fénius Farsaid Goídel Glas Lámfhind Míl Scota
Creatures >
Aes Síde Enbarr Failinis Glas Gaibhnenn
Items >
Areadbhar Four Treasures Fragarach Lúin of Celtchar Uaithne
Places >
Otherworld Magh Meall Tír na nÓg Brú na Bóinne Connla's Well Fintan's Grave Teamhair Toraigh Uisneach
Texts >
Lebor Gabála Érenn Cath Maige Tuired Tochmarc Étaíne Aided Chlainne Lir Aided Chlainne Tuirenn Immram Brain Dindsenchas
Source: . https://en.wikipedia.org/wiki/John_O%27Hart
