Mythological Cycle

The Mythological Cycle is a conventional division within Irish mythology, concerning a set of tales about the godlike peoples said to have arrived in five migratory invasions into Ireland and principally recounting the doings of the Tuatha Dé Danann. It is 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.

The term "Mythological Cycle" seems to have gained currency with Arbois de Jubainville, c. 1881–1883; usage predating this applies the term generically, e.g. to Norse mythology. In the opinion of Mackillop (1998), use of the term is "somewhat awkward today".

The characters appearing in the cycle are essentially gods from the pre-Christian pagan past in Ireland. Commentators exercising caution, however, qualify them as representing only "godlike" beings, and not gods. This is because the Christian scribes who composed the writings were generally (though not always) careful not to refer to the Tuatha Dé Danann and other beings explicitly as deities. The disguises are thinly veiled nonetheless, and these writings contain discernible vestiges of early Irish polytheistic cosmology .

Examples of works from the cycle include numerous prose tales, verse texts, as well as pseudo-historical chronicles (primarily the Lebor Gabála Érenn (LGE), commonly called The Book of Invasions) found in medieval vellum manuscripts or later copies. Some of the romances are of later composition and found only in paper manuscripts dating to near-modern times (Cath Maige Tuired and The Fate of the Children of Tuireann).

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