Finn Mac Cumhail

If he is mythological why then the reference to the Fena and having been their greatest commander unless merely to provide a warrior leader of the mythos. His association with Cormac mac Art is well known and any number of links can provide more. Suffice to say if Cormac is considered historical then Finn will be as well.

Having done a bit of reading, i've noticed some interesting similarities between Irish and Classical myth: notably Saturn trying to devour the baby Zeus (as he did to his other children). Finn had a falling-out with Cuchulain but, unwilling to get killed, defeated the giant warrior through trickery. Finn disguised himself as a baby and had his wife make cakes: some normal and some still containing the griddle. When Cuchulain ate them he broke his teeth, but Finn ate the cakes without the added iron supplement. Cuchulain put his finger in the "baby's" mouth to feel his teeth. Finn bit it off and Cuchulain ran away in shame

Fionn Mac Cumhail was a historic leader of Fianna Éireann, about whom many myths contend. Obviously the giant one is to be dismissed from a historic point of view, but his interaction with King Cormac Mac Airt is not really doubted. Additionally, Cumhail was a leader of the Fianna before him, and fought Conn Céad Chathach over the province of Leinster. Fionn too, according to some stories, had a troubled relationship with the monarchy, rebelling against them.

In the more literary stories, Fionn creates the isle of man by tossing a sod of turf into the sea... amongst other God-like escapades. He was not contemporary with Cú Chulainn.

Both very good points Toltec.