| Partholon | Leader of second invasion, the Partholons from Greece. |
| Pisear |
King of Persia and holder of the spear Luin which the Sons of Tuireann sought. |
| Province of Curoi | Limerick to Cork and westward to the coasts of Co Cork and Co Kerry Ireland. |
| Red Hills of Rian | In Brefne Co. Leitrim, Connaught,. where the Tuatha De Danaan set up camp after arriving in Ireland. |
| rath | Fortress. |
| Rechtaid the White |
One of the nine foster-fathers of Lugh. |
| Ruadh, Ruadan | Warrior/Champion of the Fir Bolg who challenged the Tuatha De Danaan to a Hurling match before the Battle of Magh Tuireadh. |
| Samhain |
Feast of the Dead, All Hallow''s Eve, Hallowe''en. October 31st |
| Samildanach |
An epithet applied to Lugh, meaning Master of all Arts. |
| Scibar |
One of the nine foster-fathers of Lugh. |
| Scuabtuinne |
The Ocean-Sweeper, Manannan's magic currach. |
| Sean Slieve |
Mountain in Erin. |
| Segais |
One of the twelve sacred mountains. |
| Semias | Semias the Bard lived in the city of Murias on the fourth great island of the Tuatha De Danaan and brought forth the Cauldron of the Dagda to Ireland. |
| Semne | Warrior of the Fir Bolg and son of Sengann. |
| Sengann | Was the name of a Fomorian King of South Munster. |
| Sgoith Gleigeil |
White Flower, one of the sons of Manannan. |
| Shannon, the |
One of the nine sacred rivers of Erin. It is, at 386 km (240 miles), Ireland's longest river. It divides the west of the island (principally the province of Connacht) from the east and south (Leinster and most of Munster). |
| Sidhe |
The Sidhe or "people of the mounds", or "The Lordly Ones" or "The Good People" or The Fey were descended from the Tuatha de Danann. |
| Sine Sindeargrugh |
The Red Ring', he was one of the sons of Manannan |
| Sital Salmhor |
One of the nobles of the Fomori. |
| Sithbrugh |
Warrior of the Fir Bolg and son of Sengann. |
| Slaine |
The Well of Slaine taht brought healing to the Tuatha De Danaan. |
| Slainge (the Fair) | A King of Fir Bolg and the tribe of Gaileoin. |
| Sliabh Belgadain |
The Black hill to the west of Magh Nia in Connaught. |
| Sliabh Bloom |
The Slieve Bloom Mountains (Sliabh Bladhma in Irish) rise from the central plain of Ireland - one of the twelve sacred mountains. |
| Sliabh Maccu Belgodon |
One of the twelve sacred mountains. |
| Sliabh League |
Located on the coast of County Donegal, Ireland, Slieve League, at 601 metres, is Europe's sixth highest sea cliff - one of the twelve sacred mountains. |
| Sliabh Snechtai |
One of the twelve sacred mountains. |
| Slemish |
One of the twelve sacred mountains, Slemish Mountain in County Antrim is about 1500 ft above sea level |
| Sreng | A champion of the Fir Bolg. In the first Battle of Magh Tuireadh he faced Nuada, king of the Tuatha De Danann, and with one great blow he cut off half his shield and severed Nuada''s arm at the shoulder. |
| Suir |
One of the nine sacred rivers of Erin. A river in Ireland that flows into the Atlantic Ocean near Waterford after a distance of 183 kilometres (114 miles). |
| Tadg |
The son of Nuada, later married to Eithne. |
| Tailltin |
Tailltin or Taillten is an outdated place name in County Meath, Ireland, and the place of the Battle of Tailltin. The second battle fought between the Sons of the Gael and the Men of Dea for the kingship of Ireland. The location of the fair of games instituted by Lugh in honour of his mother Tailltiu. |
| Tailltiu | Wife & Queen of Eochaid, High King of the Fir Bolg, Foster-mother of Lugh. |
| Temair, Teamhair, Tara | The Hill of Tara, known as Temair in gaeilge, was once the ancient seat of the High Kings of Ireland – . Temair was also the sacred place of dwelling for the gods, and was the entrance to the otherworld. |
| Tethra |
A King of the Fomori, who had the magic sword, Orna. |
| Tir Tairngire |
The Land of Promise, Manannan's Realm. |
| Tollus Dam |
One of the nine foster-fathers of Lugh. |
| Toree, Tory | The Island of Toree, one of the homes the Fomori. |
| Traigh Eabha |
A location that the Dagda was heading for. |
| Tuan |
Only surviving man of Partholon's race, shape-changer. |
| Tuath | Tribe/People/Clan/Place |
| Tuatha De Danaan |
The children of Danu and Royal Family/ancestors of the Sidhe, in the Lebor Gabala Erenn, A race of supernatural beings, they are the first and fifth group to settle in Ireland, conquering the island from the Fir Bolg. |
| Tuirenn |
Daughter of Tadg and Eithne, mother of Bran. |
| Tuireadh |
Pillars, as in Magh Tuireadh – the Plain of Pillars. Stones and heads of enemies were stacked reverently as an honour to the fallen enemy heroes. |
| Tuireann |
Son of Ogma, father of Brian, Ur and Urcar |
| Tuis |
King of Greece, holder of the magic pig-skin sought by the Sons of Tuireann. |
