Irish myths are old stories. People told them out loud. They tell of gods and heroes. Some stories are in big books. 
Irish myths are very old stories. 
These stories have many groups. One group is about gods. They are called the Tuatha Dé Danann. They live in a magic world.
Other stories are about heroes. One hero is named Finn. He led a group of warriors. They lived in the wild.
There are also tales of monsters. One is a sea serpent. It lived in lakes and rivers.
These old tales are still famous today. 
Irish mythology is a collection of very old stories. 
The Mythological Cycle tells of the Tuatha Dé Danann. These are god-like beings. They live in the Otherworld. This might be under the earth or across the sea. They can hide using a magic mist. Some gods, like Lugh and the Dagda, appear often. The Fomorians are another group. They are often seen as monsters or giants. They were enemies of the Tuatha Dé Danann.
The Heroic Cycles tell of great warriors. One is the Ulster Cycle. It tells of the hero Cú Chulainn. 
Irish mythology is a collection of ancient stories from the island of Ireland. 
The Mythological Cycle focuses on the Tuatha Dé Danann. This name means the people of the goddess Danann or Ana. 
These gods often fought against a group called the Fomorians. 
There are also heroic cycles that tell of great warriors. The Ulster Cycle features the hero Cú Chulainn. 
Many of these stories come from old books called manuscripts. Some important ones are the Book of Leinster and the Yellow Book of Lecan. These books were made hundreds of years ago. They contain legends of heroes and even tales of monsters. One monster is the Oilliphéist, which is a sea-serpent. Other stories tell of the Cailleach, a woman who lived many lives. These myths help us understand the history and wonder of ancient Ireland.
Irish mythology is the collection of indigenous myths from the island of Ireland. These stories were originally passed down through oral tradition during the prehistoric era. In the early medieval period, Christian scribes began writing these myths down. These scribes often revised the stories to align with Christian learning and history. Despite these changes, Irish mythology remains the best-preserved branch of Celtic mythology. 
Scholars conventionally group these myths into several distinct cycles. The Mythological Cycle contains tales about the Tuatha Dé Danann. This group is based on Ireland's pagan deities. This cycle also includes other mythical races like the Fomorians. Important works include the Lebor Gabála Érenn, also known as the Book of Invasions. This text serves as a legendary history of Ireland. Other notable works are the Cath Maige Tuired and the Aided Chlainne Lir.
The Tuatha Dé Danann are the primary supernatural beings in these myths. Their name is often interpreted as the folk of the goddess Danann or Ana. Some scholars believe Danann is a variant of the goddess Ana or Anu. These beings inhabit the Otherworld. This realm is described as a parallel world, a heavenly land beyond the sea, or a place under the earth. They can use a magic mist called a féth fíada to hide from humans. 
Many prominent deities belong to the Tuatha Dé Danann. The Dagda is known as the great god. Lugh is described as long-armed, and Nuada is the silver-armed king. Other figures include the sea god Manannán and the healer Dian Cécht. There are also specialized gods like Goibniu the smith and Ogma the god of eloquence. Warrior goddesses often appear as a triad: The Morrígan, Macha, and Badb. The Morrígan is known to transform into a crow, an eel, a wolf, or a cow. 
The Fomorians are a supernatural race often portrayed as hostile or monstrous. They were originally said to come from under the sea or the earth. Later stories depicted them as giants or sea raiders. They acted as the primary enemies of the Tuatha Dé Danann. However, the two races sometimes intermarried. A major conflict occurred during the Second Battle of Mag Tuired. In this battle, Lugh led a victory by slaying the Fomorian champion, Balor.
Heroic legends are divided into the Ulster Cycle and the Fenian Cycle. The Ulster Cycle focuses on the Ulaid people. Its most famous epic is the Táin Bó Cúailnge, or the Cattle Raid of Cooley. 
The Fianna were not mere outcasts, but lived in voluntary exile. They spent summers in the wild training adolescents. This period of life served as a transition from puberty to manhood. Manhood was often identified with owning or inheriting property. The Fianna protected the community from other outsiders. Some historical sources even referred to them as "sons of death." This group shows how ancient Irish society managed different social roles and boundaries.
Much of our knowledge comes from medieval manuscripts. Key sources include the Book of the Dun Cow and the Book of Leinster. The Yellow Book of Lecan also contains important legends of Finn Mac Cumhaill. These documents were often compiled by Christian monks. These monks sometimes practiced euhemerism, which is the process of treating gods as if they were historical humans. These texts preserve a vast array of lore, from the sea-serpent Oilliphéist to the many lives of the Cailleach.
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