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Poseidos was a technologically advanced city in Dinotopia's ancient past, located on a small island in Sapphire Bay, between the mainland and the Outer Island. The Empire of Poseidos was one of the four ancient empires of Dinotopia in the Age of Heroes, 4,000 years ago.

The Poseidians used the heat generated from sunstones in activating steam-powered vehicles and machines. The main classes of Poseidian vehicles were the walking strutters and the low-flying skimmers, with these machines eventually replacing dinosaurs for transportation purposes. The final ruler of Poseidos, Ogthar, eventually banned dinosaurs from the city altogether. As further advancements were made, new machines were invented for all kinds of purposes, ranging from work duties to warfare.

During the Age of Heroes, Poseidos under Emperor Ogthar threatened all of the old values of Dinotopia, with Ogthar's invasion of the mainland forcing people and dinosaurs away from their homes, along with the Poseidians organizing campaigns to capture dinosaurs for food or use in forced labor. Due to extensive mines and natural caverns beneath Poseidos, the entire city sank into the sea in the final days of the Age of Heroes, bringing an end to its empire.

In the millennia that passed since Poseidos sank, the city fell into myth and legend, with most believing that it never been real in the first place. The discovery of Poseidian treasures by Arthur Denison, Oriana Nascava, and Bix in 1867 proved that the city had once existed.



Poseidos before the reign of Ogthar.[2]


Poseidos in Ogthar's reign, during the Age of Heroes.

Poseidos was an ancient city in northeastern Dinotopia, located on a small island in Sapphire Bay.[3] Though it was younger than the southeastern Chandara,[4] Poseidos was more technologically advanced. During the Age of Heroes, 4,000 years ago, Poseidos was one of Dinotopia's four ancient empires,[3] occupying large portions of the northeastern part of the island.[5] Though they were eventually banned from the city by its final ruler, Ogthar, dinosaurs had once been respected in Poseidos, even serving as royal advisors.[6]

Ogthar’s reign saw Poseidos threaten all of the old ways of Dinotopia, with his invasions of the mainland forcing people and dinosaurs away from their homes, as well as the Poseidians organizing campaigns to hunt down and kill dinosaurs for food.[7]



Strutters in Ancient Poseidos

Poseidos was technologically advanced, powering steam-driven vehicles and machines through the use of heat generated from sunstones.[3]

The main modes of transportation developed in Poseidos were the skimmers, low-flying vehicles, and the strutters, walking vehicles. By the time of the empire’s collapse, strutters and skimmers had completely replaced dinosaurs as means of transportation, with dinosaurs eventually being banned from the capital altogether.[3] Near the end of the Age of Heroes, being a pedestrian was made illegal in Poseidos.[8]

Fritz hover-head

Fritz, a hover-head

In addition to mere machines or vehicles, a group of Poseidian scientists within the Strutterworks developed biologically-inspired sentient robots and cyborgs. The leaders of Poseidos supported such developments, as they saw it as a means of gaining immortality, having grown to despise their mortality and corruptibility of flesh. The scientists themselves aimed in some form to recreate the legendary and godlike demisaurians of Dinotopian mythology. Sentient robot technology filtered down to the Poseidian citizenry in the form of hover-heads, likeable and personal robot companions.[3]

The Poseidians invented a form of flavorless nutrition pellets, which served as the diet for a majority of the citizens.[3] The Poseidian aristocracy and command structure usually ate cooked food, with Emperor Ogthar and his defense chief Spade Sorgoff recorded as having dine on dinosaur meat.[9]


Insignia Poseidos Roff Stricker Trilobite Insignia

Trilobite insignia of Poseidos


The advancement of Poseidos came at a cost for its citizens. Most of the Poseidians knew little of what developments were being made within the Strutterworks, many living either in shantytowns on the fringes of the imperial capital or in crowded communal dormitories.[3] Many Poseidians were driven into poverty as new machines were invented that took over their jobs, making them obsolete in the workforce.[9]

Entertainment was provided in the form of sporting events and circuses. Many Poseidian sporting events during the Age of Heroes pitted dinosaurs against machines of Poseidian origin.[3]

Fall of Poseidos[]

Sinking of Poseidos

Poseidos collapses and sinks into the sea, as survivors flee abord ships or on the backs of sea creatures.

The ground beneath the city of Poseidos was hollowed out over the years because of extensive mining and,[4] unbeknownst to the city’s visionary architects, empty volcanic caverns already made the foundations weak.[11] There existed an enormous network of catacombs underneath the city, composed of various tunnels, pits, and drains, as well as facilities where critics of the Poseidian regime were imprisoned. One of the many resistance movements against the empire was headquartered in these catacombs.[4]

The city managed to stay standing despite the hollowed out soil beneath it, due to great pillars in the Golgorra Catacombs. Eventually, these pillars gave way and parts of Poseidos began to collapse. Over the course of just two years, the city was destroyed as seawater filled the streets and it sank to the bottom of Sapphire Bay, marking the end of the Age of Heroes. Thousands died in the catastrophe, but many managed to reach the safety of the mainland on ships or with the aid of sea creatures, with mainlanders helping in the rescue efforts.[4] Most of them fled to the city of Prosperine, located across the water.[11] Ogthar led some survivors into the World Beneath, taking many of Poseidos’ royal treasures,[4] and a small fleet of strutters,[11] with him.[4] Among these treasures was the Ruby Sunstone, possessing great power, recently discovered prior to the city’s collapse.[11]

The Poseidians lived for as long as they could underground, attempting to rebuild their laboratories in the World Beneath, but they were eventually divided by strife[11] and some of them[12] emerged from the caverns in search of a new life. The royal treasury, including the Ruby Sunstone, was given over to the tyrannosaurs in exchange for safe passage through the Rainy Basin,[11] where some of them made a new life for themselves, constructing the Palace of Kings.[12]


Map Ancient Poseidos

The approximate extent of the Empire of Poseidos during the Age of Heroes

By the time of Arthur Denison’s arrival and travels in Dinotopia during the 19th century, Ogthar, Poseidos, and the sunstones had been forgotten as historical fact, fading into legend. Though ancient scrolls writing of Poseidos survived, they were seen as fantasy and not fact.[13] Nallab, assistant librarian of Waterfall City, stated in 1867, shortly before Arthur Denison’s rediscovery of the sunstones and the strutters, that “Dinotopia has no half-human kings and no metal monsters and no Poseidos”.[14] Despite widespread belief that Poseidos and its empire were nothing more than myths, modern Dinotopians retained vague cultural memories of the events and figures of the Age of Heroes that were recognized as factual, including Gideon Altaire, Desert Resistance, and the Strutter Invasion.[15]

In 1867, Arthur Denison, Oriana Nascava, and Bix discovered an ancient photographic device and daguerreotypes, alongside other treasures, in a temple in the Rainy Basin, proving that Poseidos had once existed.[16] Through the daguerreotypes, the story of the fall of Poseidos could be reconstructed, though Denison’s reconstruction blamed the city’s collapse solely on the natural volcanic caverns beneath it rather than the extensive mines. Denison believed that the dinosaurs had left Poseidos willingly as they were no longer needed due to the invention of the strutters.[11]

Arthur Denison believed that the fate of Poseidos could have influenced the Greek myth of the sunken city of Atlantis, with the name of the greek god of the sea, Poseidon, possibly deriving from the ancient Dinotopian city.[17]


  1. Dinotopia: First Flight, 20th Anniversary Edition, p. 72
  2. Dinotopia: First Flight, 20th Anniversary Edition, p. 62 – Ogthar made it illegal to be a pedestrian in Poseidos.
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Dinotopia: First Flight, 20th Anniversary Edition, p. 95
  4. 4.0 4.1 4.2 4.3 4.4 4.5 Dinotopia: First Flight, 20th Anniversary Edition, p. 96
  5. Dinotopia: First Flight, 20th Anniversary Edition, p. 0
  6. Dinotopia: First Flight, 20th Anniversary Edition, p. 107
  7. Dinotopia: First Flight, 20th Anniversary Edition, p. 67
  8. Dinotopia: First Flight, 20th Anniversary Edition, p. 62
  9. 9.0 9.1 Dinotopia: First Flight, 20th Anniversary Edition, p. 63
  10. Dinotopia: First Flight, 20th Anniversary Edition – the main state symbol of Poseidos appears to have been the trilobite. It appears on the Poseidian skimmers (p. 24) and on the uniforms of the guards in the Strutterworks (p. 19) and the uniform of Roff Stricker (p. 8). The design pictured here follows the design on Roff Stricker's uniform.]]
  11. 11.0 11.1 11.2 11.3 11.4 11.5 11.6 Dinotopia: The World Beneath, 20th Anniversary Edition, p. 138
  12. 12.0 12.1 Dinotopia: First Flight, 20th Anniversary Edition, p. 104
  13. Dinotopia: The World Beneath, 20th Anniversary Edition, p. 20
  14. Dinotopia: The World Beneath, 20th Anniversary Edition, p. 21
  15. Dinotopia: Journey to Chandara, New Expanded Edition, p. 96
  16. Dinotopia: The World Beneath, 20th Anniversary Edition, p. 137
  17. Dinotopia: The World Beneath, 20th Anniversary Edition, p. 136