Manannán mac Lir (Ireland)
Manannán mac Lir is Ireland’s oldest god — the god of the sea, guardian of the Otherworld, and master of Mana. Fermanagh (‘Fir Mana’ = Men of Mana) is named for the territory where his worship was centred.
Source: MN Sound · Founding Deities
The Irish manifestation of the M-N founding deity. Manannán guards the passage between worlds — the same liminal function as the troll under the bridge. His connection to the sea links to the D-N river system (Don, Donets). The German consul’s question that sparked Finding Manuland: ‘Is our Mannus related to your Manannán?’