Ulster Cycle in the context of County Louth

Irish mythology is the body of myths indigenous to the island of Ireland. It was originally passed down orally in the prehistoric era. In the early medieval era, myths were written down by Christian scribes, who Christianized them to some extent. Irish mythology is the best-preserved branch of Celtic mythology.

The myths are conventionally grouped into 'cycles'. The Mythological Cycle consists of tales and poems about the god-like Tuatha Dé Danann, who are based on Ireland's pagan deities, and other mythical races like the Fomorians. Important works in the cycle are the Lebor Gabála Érenn ("Book of Invasions"), a legendary history of Ireland, the Cath Maige Tuired ("Battle of Moytura"), and the Aided Chlainne Lir ("Children of Lir"). The Ulster Cycle consists of heroic legends relating to the Ulaid, the most important of which is the epic Táin Bó Cúailnge ("Cattle Raid of Cooley"). The Fenian Cycle focuses on the exploits of the mythical hero Finn and his warrior band the Fianna, including the lengthy Acallam na Senórach ("Tales of the Elders"). The Cycles of the Kings comprises legends about historical and semi-historical kings of Ireland (such as Buile Shuibhne, "The Madness of King Sweeny"), and tales about the origins of dynasties and peoples.

Táin Bó Cúailnge (Modern Irish pronunciation: [ˈt̪ˠaːnʲ bˠoː ˈkuəlʲɲə]; "the driving-off of the cows of Cooley"), commonly known as The Táin or less commonly as The Cattle Raid of Cooley, is an epic from Irish mythology. It is often called "the Irish Iliad", although like most other early Irish literature, the Táin is written in prosimetrum, i.e. prose with periodic additions of verse composed by the characters. The Táin tells of a war against Ulster by Queen Medb of Connacht and her husband King Ailill, who intend to steal the stud bull Donn Cuailnge. Due to a curse upon the king and warriors of Ulster, the invaders are opposed only by the young demigod, Cú Chulainn.

The Táin is traditionally set in the 1st century in a pagan heroic age, and is the central text of a group of tales known as the Ulster Cycle. It survives in three written versions or "recensions" in manuscripts of the 12th century and later, the first a compilation largely written in Old Irish, the second a more consistent work in Middle Irish, and the third an Early Modern Irish version.

Cú Chulainn (/kuːˈkʌlɪn/ koo-KHUL-in Irish: [kuːˈxʊlˠɪn̠ʲ] ), is an Irish warrior hero and demigod in the Ulster Cycle of Irish mythology, as well as in Scottish and Manx folklore. He is believed to be an incarnation of the Irish god Lugh, who is also his father. His mother is the mortal Deichtine, sister of King Conchobar mac Nessa.

Born Sétanta, he gained his better-known name as a child, after killing Culann's fierce guard dog in self-defence and offering to take its place until a replacement could be reared, hence he became the "Hound (cú) of Culann". He was trained in martial arts by Scáthach, who gave him the spear Gáe Bulg. It was prophesied that his great deeds would give him everlasting fame, but that his life would be short. At the age of seventeen he defended Ulster single-handedly against the armies of Queen Medb of Connacht in the famous Táin Bó Cúailnge ("Cattle Raid of Cooley"). He is known for his terrifying battle frenzy (ríastrad), in which he becomes an unrecognisable monster who knows neither friend nor foe. He fights from his chariot, driven by his loyal charioteer Láeg and drawn by his horses, Liath Macha and Dub Sainglend.

Tochmarc Emire ("The Wooing of Emer") is one of the stories in the Ulster Cycle of Irish mythology and one of the longest when it received its form in the second recension (below). It concerns the efforts of the hero Cú Chulainn to marry Emer, who appears as his wife in other stories of the cycle, and his training in arms under the warrior-woman Scáthach. The tochmarc ("wooing" or "courtship") (along with cattle raids, voyages, feasts, births and deaths) is one of the 'genres' of early Irish literature recognised in the manuscript corpus.

Medb (Old Irish: [mʲeðβ]), later spelled Meadhbh (Middle Irish: [mʲɛɣβ]), Méabh(a) (Irish: [ˈmʲeːw(ə)]) and Méibh (Irish: [mʲeːvʲ]), and often anglicised as Maeve (/meɪv/ MAYV), is queen of Connacht in the Ulster Cycle of Irish mythology. Her husband in the core stories of the cycle is Ailill mac Máta, although she had several husbands before him who were also kings of Connacht. She rules from Cruachan (now Rathcroghan, County Roscommon). She is the enemy (and former wife) of Conchobar mac Nessa, king of Ulster, and is best known for starting the Táin Bó Cúailnge ("The Cattle Raid of Cooley") to steal Ulster's prize stud bull Donn Cúailnge.

Medb is strong-willed, ambitious, cunning and promiscuous, and is an archetypal warrior queen. She is believed by some to be a manifestation of the sovereignty goddess. Medb of Connacht is probably identical with Medb Lethderg, the sovereignty goddess of Tara.

The Mythological Cycle is a conventional grouping within Irish mythology. It consists of tales and poems about the god-like Tuatha Dé Danann, who are based on Ireland's pagan deities, and other mythical races such as the Fomorians and the Fir Bolg. It is one of the four main story 'cycles' of early Irish myth and legend, along with the Ulster Cycle, the Fianna Cycle and the Cycles of the Kings. The name "Mythological Cycle" seems to have gained currency with Arbois de Jubainville c. 1881–1883. James MacKillop says the term is now "somewhat awkward", and John T. Koch notes it is "potentially misleading, in that the narratives in question represent only a small part of extant Irish mythology". He prefers T Ó Cathasaigh's name, Cycle of the Gods. Important works in the cycle are the Lebor Gabála Érenn ("Book of Invasions"), the Cath Maige Tuired ("Battle of Moytura"), the Aided Chlainne Lir ("Children of Lir") and Tochmarc Étaíne ("The Wooing of Étaín").

The Fenian Cycle (/ˈfiːniən/), Fianna Cycle or Finn Cycle (Irish: an Fhiannaíocht) is a body of early Irish literature focusing on the exploits of the mythical hero Finn or Fionn mac Cumhaill and his warrior band the Fianna. Sometimes called the Ossianic Cycle /ˌɒʃiˈænɪk/ after its narrator Oisín, it is one of the four groupings of Irish mythology along with the Mythological Cycle, the Ulster Cycle, and the Kings' Cycles. Timewise, the Fenian cycle is the third, between the Ulster and Kings' cycles. The cycle also contains stories about other famous Fianna members, including Diarmuid, Caílte, Oisín's son Oscar, and Fionn's rival Goll mac Morna.

The Cycles of the Kings or Kings' Cycles, sometimes called the Historical Cycle, are a body of Old and Middle Irish literature. They comprise legends about historical and semi-historical kings of Ireland (such as Buile Shuibhne, "The Madness of King Suibhne"), stories about the origins of dynasties and peoples (such as The Expulsion of the Déisi), accounts of significant battles (such as Battle of Mag Mucrama), as well as anecdotes that explain rites and customs. It is one of the four main groupings of early Irish sagas, along with the Mythological Cycle, the Ulster Cycle and the Fianna Cycle.

The kings that are included range from the almost entirely fictional Labraid Loingsech, who allegedly became High King in the 4th century BC, to the entirely historical Brian Boru. Other kings include Cormac mac Airt, Niall of the Nine Hostages, Conall Corc, Diarmait mac Cerbaill, Lugaid mac Con, Conn of the Hundred Battles, Lóegaire mac Néill and Crimthann mac Fidaig. It was part of the duty of the medieval Irish bards, or court poets, to record the history of the family and the genealogy of the king they served. This they did in poems that blended the mythological and the historical to a greater or lesser degree.

Ailill mac Máta is the king of the Connachta and the husband of queen Medb in the Ulster Cycle of Irish mythology. He rules from Cruachan (Rathcroghan in County Roscommon).

In the Ulster Cycle of Irish mythology Donn Cúailnge, the Brown Bull of Cooley, was an extremely fertile stud bull over whom the Táin Bó Cúailnge (Cattle Raid of Cooley) was fought.

Conchobar mac Nessa (son of Ness) is the king of Ulster in the Ulster Cycle of Irish mythology. He rules from Emain Macha (Navan Fort, near Armagh). He is usually said to be the son of the High King Fachtna Fáthach, although in some stories his father is the druid Cathbad, and he is usually known by his matronymic, mac Nessa: his mother is Ness, daughter of Eochaid Sálbuide, King of Ulster.

Conchobar was an important figure in the Ulster Cycle, appearing in the Táin Bó Cúailnge and a number of other stories where he is depicted as a good king.

In the Ulster Cycle of Irish mythology, Culann was a smith whose house was protected by a ferocious watchdog. Culann's hound was a pup of Celtchar's hound Dael, and he was found in the skull of Conganchnes mac Dedad along with two other pups (Celtchar and Mac da Tho's hounds); Culann's hound was speckled, while Celtchar and Mac da Tho's hounds were black and grey, respectively.

Culann invited Conchobar mac Nessa, king of Ulster, and his retinue to a feast at his house. On the way Conchobar saw his young nephew Sétanta playing hurling, and was so impressed he invited the boy to join him at the feast. Sétanta told him he would catch up once the game was over.

Scáthach (Irish: [ˈsˠkaːhəx]) or Sgàthach (Scottish Gaelic: Sgàthach an Eilean Sgitheanach) is a figure in the Ulster Cycle of Irish mythology. She is a legendary Scottish warrior woman and martial arts teacher who trains the legendary Ulster hero Cú Chulainn in the arts of combat. Texts describe her homeland as Scotland (Alpeach); she is especially associated with the Isle of Skye, where her residence Dún Scáith ("Fortress of Shadows") stands. She is called "the Shadow" and "Warrior Maid" and is the rival and sister of Aífe, both of whom are daughters of Árd-Greimne of Lethra.

The Gáe Bulg (Old Irish pronunciation: [ɡaːi̯ ˈbulg]) (also Gáe Bulga, Gáe Bolg, Gáe Bolga), meaning "spear of mortal pain/death", "gapped/notched spear", or "belly spear", was the name of the spear of Cú Chulainn in the Ulster Cycle of Irish mythology. It was given to him by his martial arts teacher, the warrior woman Scáthach, and its technique was taught only to him.

It was made from the bone of a sea monster, the Curruid, that had died while fighting another sea monster, the Coinchenn. Although some sources make it out to be simply a particularly deadly spear, others—notably the Book of Leinster—state that it could only be used under very specialized, ritual conditions:

Láeg, or Lóeg, son of Riangabar, is the charioteer and constant companion of the hero Cú Chulainn in the Ulster Cycle of Irish mythology. His horses are Liath Macha and Dub Sainglend.

Cú Chulainn sends Láeg to the Otherworld with Lí Ban, sister to Fand, and he brings back bountiful descriptions of the Otherworld in the tale Serglige Con Culainn (The Sickbed of Cúchulainn). In the tale of Cú Chulainn's death, he is killed by Lugaid mac Con Roí with a spear intended for Cú Chulainn.

Liath Macha ("grey [horse] of Macha") and Dub Sainglend ("black [horse] of Saingliu") are the two chariot-horses of Cúchulainn in the Ulster Cycle of Irish mythology.

Both horses appear to Cúchulainn from the pool of Linn Liaith in the mountains of Sliab Fuait, a gift from either Macha or her sister the Morrígan. Cúchulainn leaps onto their backs, and they run around Ireland for a day but cannot throw him off, after which they were tame.

Navan Fort (Old Irish: Emain Macha [ˈeβ̃ənʲ ˈβ̃axa]; Modern Irish: Eamhain Mhacha [ˌəunʲ ˈwaxə]) is an ancient ceremonial monument near Armagh, Northern Ireland. According to tradition it was one of the great royal sites of pre-Christian Gaelic Ireland and the capital of the Ulaidh. It is a large circular hilltop enclosure—marked by a bank and ditch—inside which is a circular mound and the remains of a ring barrow. Archeological investigations show that there were once buildings on the site, including a huge roundhouse-like structure that has been likened to a temple. In a ritual act, this timber structure was filled with stones, deliberately burnt down and then covered with earth to create the mound which stands today. It is believed that Navan was a pagan ceremonial site and was regarded as a sacred space. It features prominently in Irish mythology, especially in the tales of the Ulster Cycle. According to the Oxford Dictionary of Celtic Mythology, "the [Eamhain Mhacha] of myth and legend is a far grander and mysterious place than archeological excavation supports".

Navan Fort is the heart of the larger 'Navan complex', which also includes the ancient sites of Haughey's Fort (an earlier hilltop enclosure), the King's Stables (a manmade ritual pool) and Loughnashade (a natural lake that has yielded votive offerings).

Cú Roí mac Dáire (Cú Ruí, Cú Raoi) is a king of Munster in the Ulster Cycle of Irish mythology. He is usually portrayed as a warrior with superhuman abilities and a master of disguise possessed of magical powers. His name probably means "hound of the plain/field", or more specifically, "hound of the battlefield". He is the son of Dáire mac Dedad (or Dáire Doimthech), and thus belongs to the Clanna Dedad. However, T. F. O'Rahilly believed this to be artificial, stating that "Cú Roí and Dáire are ultimately one and the same".

Though often an outsider figure, for instance in the role of intervener or arbitrator, Cú Roí appears in a great number of medieval Irish texts, including Forfess Fer Fálgae, Amra Con Roi, Brinna Ferchertne, Aided Chon Roi (in several recensions), Fled Bricrenn, Mesca Ulad and Táin Bó Cúailnge. The early Irish tale-lists refer to such titles as Aided Chon Roí, Echtra Chon Roí (List A), Orgain Chathrach Chon Roí and Cathbúada Con Roí (List B), but only the first of these tales can be shown to have survived in some form. Several tales describe the enmity between him and the Ulster hero Cú Chulainn, who eventually kills him.