Strong in the Deep: Norse Mythology, the Viking Longship and the World Tree Explained

The Vikings have never gone away. Across more than a thousand years of history, scholarship, literature, film, and now collectible culture, the Norse world continues to exert a pull that few other civilisations can match. It is not difficult to understand why. The Norse mythological tradition is one of the richest and most internally consistent bodies of imaginative thought in human history — a complete cosmology, a moral framework, a bestiary, and a vision of the end of the world, all encoded in sagas, kennings, and carved stone.

Two images sit at the heart of that tradition with particular force: the Viking longship and the World Tree Yggdrasil. One is a vessel of war, exploration, and trade — the object that made the Viking Age possible. The other is the axis of the universe itself, the cosmic structure around which all nine realms are arranged. Together they represent the two poles of the Norse imagination: the world as it is navigated and the world as it is understood. Both appear on the Fortis in Profundis Viking Coin — one face each, in full colour on antique copper. This is what they mean.

Fortis in Profundis: What the Phrase Means

The Latin inscription that arcs across the top of the longship face — FORTIS IN PROFUNDIS — translates as "strong in the deep." It is a phrase that works on several levels simultaneously.

At its most literal, it describes the Viking longship in the open ocean: a vessel navigating deep water, tested by storm and wave, crewed by men who had committed fully to the crossing. The deep here is the North Atlantic, the Norwegian Sea, the waters that separated Scandinavia from the coasts that Norse raiders and traders would reach. To be strong in the deep was a practical virtue — the quality that brought a ship and its crew home.

At a more resonant level, the phrase captures the Norse attitude toward adversity. The world of Norse mythology is not a comfortable one. It is a world in which the gods themselves are mortal, in which Ragnarök — the doom of the gods — is not a possibility but a certainty. The appropriate response to this is not despair but a particular kind of fortitude: the willingness to act with full force and full commitment in the knowledge that all things end. Fortis in profundis. Strong in the deep.

The Viking Longship: Engineering, Terror and Symbol

The Viking longship was one of the most significant technological achievements of the early medieval world. Its design solved a problem that had defeated earlier shipbuilders: how to build a vessel that could cross open ocean and navigate shallow rivers, that could be beached directly on a shore without a harbour, and that could carry a war party in fighting condition after weeks at sea.

The solution was the clinker-built hull — overlapping planks of oak, flexible enough to flex with the waves rather than resist them, shallow-drafted enough to beach on a strand or row up a river. The mast and sail handled open water; the oars handled harbours, rivers, and calms. A longship of the largest class could carry sixty or seventy warriors across the North Atlantic and deliver them combat-ready on a beach in Northumbria, Ireland, or Normandy within hours of landing.

The psychological impact of the longship's arrival was itself a weapon. The ships appeared without warning on coasts that had no warning systems equal to the speed of a Viking crossing. The first sight of a fleet of dragon-prowed longships emerging from early morning mist, oars moving in unison, was designed to be devastating — and it was. The longship did not just transport Vikings. It announced them.

The Dragon Prow and the Ravens of Odin

The dragon prow that gives the dragonship its name was not purely decorative. Norse law codes from the Viking Age specifically required that dragon prows be removed when approaching a friendly coast, so that the land spirits — the landvættir — would not be frightened away. The prow was understood to carry genuine supernatural force, projecting the ship's power ahead of it across the water.

On the longship face of the Fortis in Profundis coin, the dragon prow coils forward into a breaking wave, its mouth open, while the sail above carries the emblem of a raven — the bird of Odin, the Allfather. Odin kept two ravens, Huginn and Muninn — Thought and Memory — who flew across the nine realms each day and returned to whisper what they had seen into his ears. A raven on the sail of a Viking longship was a direct invocation of Odin's knowledge and protection. It was also a practical navigation tool: Norse sailors released ravens to find land, watching which direction they flew.

The combination of dragon prow and raven standard on the coin places the ship firmly within Norse religious practice as well as Norse military history. This is not a raiding vessel operating outside sacred meaning — it is a vessel operating within it.

Yggdrasil: The World Tree at the Centre of Everything

Turn the coin over and the ocean storm gives way to something older and quieter: Yggdrasil, the immense ash tree that the Norse understood as the structural axis of the universe. The name itself has been interpreted as "Odin's horse" — a kenning for the gallows, since Odin hung himself from the tree for nine days and nine nights to win the knowledge of the runes. The World Tree is therefore simultaneously the frame of the universe and the site of the Allfather's self-sacrifice for wisdom.

Yggdrasil connects the nine realms of Norse cosmology — Asgard at the crown, Midgard (the world of humans) at the trunk, and Niflheim at the deepest root. Its branches reach into the heavens. Its three roots extend to the Well of Urðr (the well of fate, tended by the Norns), to Mímisbrunnr (the well of wisdom, where Odin sacrificed an eye for a drink), and to the realm of Niflheim where the dragon Níðhöggr gnaws eternally at the root.

The coin's reverse renders Yggdrasil in extraordinary detail: the massive twisted trunk rising from knotwork roots, a great eagle perched at the crown with a hawk between its eyes, two ravens in the branches, four stags grazing in the canopy — Dáinn, Dvalinn, Duneyrr and Duraþrór, who according to the Prose Edda feed on the foliage of the tree — and at the roots, the coiled green form of Níðhöggr. The runic border and the Valknut symbol complete a coin that is, in effect, a complete diagram of the Norse universe.

The Creatures of Yggdrasil

The Norse sources are unusually specific about the creatures that inhabit Yggdrasil, and the coin captures several of them with precision.

The eagle at the crown is unnamed in the Prose Edda but described as enormously wise, with the hawk Veðrfölnir sitting between its eyes. The eagle and the dragon Níðhöggr are in a state of permanent enmity — the squirrel Ratatoskr runs up and down the trunk carrying insulting messages between them, stirring the conflict. This detail — the cosmic tree as the site of a perpetual argument mediated by a squirrel — is characteristic of the Norse mythological tradition's combination of grandeur and dry humour.

The four stags represent the constant consumption of the tree: they eat its foliage perpetually, just as Níðhöggr gnaws its roots. Yggdrasil is in a state of permanent damage, held together by the care of the Norns who water it daily from the Well of Urðr. The World Tree endures despite constant assault from above and below — which is perhaps the most Norse of all possible cosmological statements.

The Nine Realms and the Structure of Norse Cosmology

The nine realms connected by Yggdrasil represent a complete cosmological system. Asgard is the realm of the Aesir gods — Odin, Thor, Freya, Loki and the rest. Vanaheim is the realm of the Vanir, an older race of gods associated with fertility and nature. Alfheim is the realm of the light elves. Midgard is the realm of humans, encircled by the ocean where the Midgard Serpent Jörmungandr lies coiled. Jötunheimr is the realm of the giants. Svartalfheim is the realm of the dwarves. Niflheim is the primordial realm of ice and mist. Muspelheim is the primordial realm of fire. Helheim is the realm of the dead — those who did not die in battle and therefore did not go to Valhalla.

This is not a simple heaven-and-hell cosmology. It is a complex, populated universe in which multiple races with competing interests inhabit distinct but connected realms, all structured around a tree that is simultaneously a map, a living being, and a sacred site. The sophistication of this cosmological vision is one of the reasons Norse mythology continues to reward sustained attention.

Two Faces, One Coin: The Fortis in Profundis Viking Coin

The Fortis in Profundis Viking Coin from One More Coin presents these two images — the longship in the storm and the World Tree in its cosmic stillness — as the two faces of a single object. The pairing is not arbitrary. The longship represents the Norse world in action: the outward thrust, the crossing, the warrior in the wave. Yggdrasil represents the Norse world in understanding: the cosmological structure that gives meaning to the action, the tree that connects all things, the axis around which the nine realms turn.

The coin is struck in antique copper — a finish that suits Norse subject matter particularly well. Copper has been worked by Scandinavian craftspeople since the Bronze Age. The reddish-brown warmth of the antique copper finish gives the longship face the colour of a storm-lit sky and gives the Yggdrasil face the deep, organic tones of ancient bark and root. The full colour enamel work on both faces is exceptional — the crashing blue-white waves, the lightning in the storm clouds, the deep greens of the World Tree's canopy, the coiled green of Níðhöggr at the root.

This piece is a Viking Norse collectible coin designed for display, collection, and gifting.

For collectors drawn to the Viking and Norse tradition, this coin also connects naturally with a broader collecting context. Our piece on coin treasures still waiting to be found explores the historical reality of Norse hoards and buried coin finds — the archaeological counterpart to the mythological world the Fortis in Profundis coin depicts.

The Viking and Norse Collection

The Fortis in Profundis coin is part of the Viking and Norse Collection at One More Coin — a range of coins covering the full breadth of Norse mythology and Viking history, from runic symbolism to Odin, Thor and the major figures of the Norse pantheon. For collectors building a Norse-themed display, the collection offers the depth to create a genuinely comprehensive arrangement.

Free worldwide tracked shipping is included on every order. Estimated delivery 9–14 days. Each coin is securely packaged for safe arrival.

Because every collection deserves one more coin.

FAQ

What does Fortis in Profundis mean?
Fortis in Profundis is Latin for "strong in the deep." On the Viking Longship coin it refers to the courage and endurance of Viking seafarers navigating open ocean, as well as the broader Norse philosophical attitude toward adversity — strength in the face of forces that cannot be controlled.

What is Yggdrasil?
Yggdrasil is the immense ash tree at the centre of Norse cosmology. It connects the nine realms — from Asgard at its crown to Niflheim at its roots — and is tended by the Norns, the Norse fates. Its name is often interpreted as meaning "Odin's horse," a kenning for the gallows from which Odin hung himself to gain the knowledge of the runes.

What creatures live in Yggdrasil?
According to the Prose Edda, Yggdrasil is inhabited by an eagle with a hawk between its eyes at the crown, four stags (Dáinn, Dvalinn, Duneyrr and Duraþrór) in the canopy, the squirrel Ratatoskr running up and down the trunk, and the dragon Níðhöggr gnawing at the roots. Ravens associated with Odin also appear in the tree.

What is the Viking longship made of?
Viking longships were primarily built from oak, using clinker construction — overlapping planks fastened with iron rivets. The flexible hull design allowed the ship to flex with waves rather than resist them, making it seaworthy in open ocean while shallow enough to beach directly on shore.

Is the Fortis in Profundis coin legal tender?
No. The Fortis in Profundis Viking Coin is a commemorative collectible and is not issued by a government mint, not legal tender, and not an investment product. It is intended for hobby collecting and display.

What finish is the coin?
The coin is finished in antique copper with full colour enamel work on both faces. The 1oz .999 copper construction gives it substantial weight and presence as a display piece.