Fionn mac Cumhaill

Fionn mac Cumhaill was a legendary Irish hero and the leader of the band of warriors known as the Fianna. He was born to Cumhall, an earlier leader of the Fianna, and his wife Muirne, a druid's daughter. Cumhall would be killed in battle by Goll mac Morna, who replaced him as the Fianna's leader.

Fionn was raised and taught by his druid aunt and the warrior woman Liath Luachra, who taught him all the basic skills of a warrior.

After setting out on his own, Fionn would achieve many great feats. He attained great knowledge from eating the Salmon of Knowledge, slew the fire-breathing demon Aillen, and replaced Goll as the leader of the Fianna.

The Fianna prospered under Fionn. Their numbers grew to around twenty-thousand. When they were fighting or hunting, they spent every moment training to become the fastest, strongest, most agile, and most capable warriors in Ireland.

The Fianna would eventually fall apart as a result of a change in character for Fionn, caused by a feud between him and Diarmuid, one of the most famous members of the Fianna. After the collapse, Fionn and his remaining followers descended into a cave to sleep, where they will remain until they awaken to save Ireland in it's greatest hour of need.