Ylaven (world)

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Ylaven/Lanth (Spinward Marches 1916)
Milieu 1116
StarportX No Starport
Size5 Medium (8,000 km, 0.40g - 0.57g)
Atmosphere8 Dense
Hydrographics7 Wet World 70%
Population5 Moderate (900 thousand)
Government5 Feudal Technocracy
Law2 Low Law (no energy weapons)
Tech Level4 Industrial (combustion)
See also UWP
System Details
Primary F9 V
Worlds 11
Gas Giants 2
Planetoid Belts 2
Cultural Details
Government Feudal technocracy
Law Level Low
Cultural Extension 1311
Army Size (BEs) 10
Economic Details
Technology Level 4
Economic Extension
Labor4Moderate (90 thousand)
Infrastructure2 Extremely limited
Efficiency-5Extremely poor
Importance Extension -2
Resource Units 28
GWP (BCr) 0
World Trade Number 0
Trade Volume (MCr/year) 0
Starport Details
Classification Class-X
Port Size 0
Building Capacity (Tons) 0
Port employees 0
Port passengers (annual) 0

Ylaven is an agricultural world with an ideal environment for producing food from plants, animals, or other forms. The system has a population in the hundreds of thousands of sophonts. This world designated as a Red Zone with an environment, laws, customs, life forms, or other conditions that make it extremely dangerous to visitors. Everyone is forbidden to travel here. This a low technology world with technology competency below the standard for Charted Space. It is a member of Third Imperium in the Lanth Subsector of Spinward Marches Sector and in the Domain of Deneb.

Astrography & Planetology[edit]

No information yet available.

Monostellar System[edit]

Ylaven Monostellar System
Star Name Hierarchy Category Mass (Sol) Temp (K) Luminosity (Sol)

F9 V

Primary Main Sequence 1.092 5500 - 6200 1.668
Unit Diameter Min Distance Hab Zone Jump Shadow M-Drive Limit
AU 0.01027 0.10712 1.03 - 1.67 1.027 10.27
Orbit #  * 0 4 3 7

IISS GURPS Astrographics Survey[edit]

1916 Ylaven (Imperial) - Red Zone

Starport: Class 0.

Diameter: 5,106 miles (8,200 km).
Atmosphere: Dense oxygen-nitrogen.
Hydrographics: 68%.
Climate: Very Cold.
Population: 532,000.
Government: Technocracy.
Control Level: 1.
Tech Level: 5.
World Trade Number: 0.

History & Background (Dossier)[edit]

Ylaven is interdicted to protect the development of the indigenous human population, who appear to be the descendants of a sublight colony mission from Terra. They are clustered in a large settlement on the coast of a shallow inland sea. Hunters and trappers wander inland for months on end, returning to civilization when they have accumulated a suitable amount of furs to sell. Other industry includes a little ore mining and primitive greenhouse agriculture. [2]

Historical Information[edit]

Ylaven was colonized by an old Solomani STL mission sometime in the Long Night. When first discovered by IISS, the population had regressed to pre-industrial levels, and the world was interdicted. Despite slow scientific progress, the locals managed to finally reach TL–5 in 1150, and RISS successfully contacted them in 1154. Despite severe cultural gaps with their neighbors, the Ylavenites have slowly adjusted, in large part aided by their remote location. The world's economy is dominated by farms that provide food products for naval bases on nearby Ghandi and D'Ganzio. The new government code reflects a change made in 1186, in the wake of growing demands on local infrastructure made by the population.

Original Settlement:[edit]

The first colonists arrived on Ylaven, or as they call it Dakota, around -500. They were in suspended animation since they left Terra almost 2000 years before. When their ship arrived at Ylaven they landed and cannibalized its hull to build shelters and burrow an underground shelter against the cold. Over the course of 30 years they performed extensive projects seeding the world with many of the life forms they had brought with them from Terra. [3]

Their largest project was planting millions of trees to help raise and maintain oxygen levels in the atmosphere. This has been their largest and most successful efforts, almost the entire continent is completely covered by a sea of evergreens. Along with this they planted a collection of shrubs and other ground hugging plants to provide shelter for the smaller wildlife they were going to release.[3]

By the end of their 30 years preparation they began releasing the higher life forms into the forests, Deer first to establish a population base and spread across the continent. This was followed by the more predatory species like Bears and eventually Lions.[3]

Another of their projects was to seed the Baltic Sea with life, including salmon and trout, which forms a major part of their diet.[3]


About 50 years after making planet fall, there was an accident in the power plant of their cave shelter. The fusion reactor which had provided all their power exploded killing fully two thirds of the population including many scientists.[3]

The survivors fled the radiation flooded caves and eventually settled on the coast of the Baltic Sea. They survived on the fish of the sea and deer that gathered in the area.[3]

Over the next generation, much of the technology that had been salvaged, including small power sources, computers, weapons and vehicles, either broke down or was lost. The TL had dropped to about TL–2, although Environmental TL dropped further to TL–1.[3]

Rebirth of Science:[edit]

Ylaven wallowed at this level for nearly 800 years (300IC), until a figure arose and began teaching the science of the ancestors. Many rejected his teachings as heretical and likely to bring disaster down on them. These Luddites grew violent against the students who fought to protect their new master. [3]

The new scientists used several advanced weapons to quell their opponents, whenever they came into conflict. Riots raged in Chicago on and off for many years until the Luddite leaders suddenly conceded defeat and declared the scientists their masters. This was met with much concern by the populace but they had lost the will to fight after nearly a decade of fighting. The instigators had turned to the other side. The scientists had won.[3]


Under the scientists the population grew a hundred fold, no longer held in check by poor sewage and disease. Farming of the fish stocks in the Baltic also helped sustain the population, and raised the overall standard of living. They developed improved construction materials and better road surfaces. [3]

Imperial Navy actions in the system included destroying the base of the notorious pirate Mous Alhabah who disappeared with his treasure in 429.[3]

The Telegraph was developed around 50 years ago, and is slowly being supplanted by the voice telephone. Today around 1 in 10 households have a telephone.[3]

During the Fifth Frontier War:[edit]

The Ylaven system was captured by the Zhodani during 1109. It was during this period of occupation that a long term base was established in the outer planetoid belt. It has remained undetected through to 1120. The IISS's interdiction has focused on the Ylaven mainworld and the Gas Giants that would be used for wilderness refuelling.[3]

Steam engines were developed within the last ten years and a simple rail system that runs from one end of the city to the other has almost been completed. [3]

Natural Disaster:[edit]

Around 20 years ago there was a totally unprecedented earthquake that leveled most of the poorer areas of Chicago. Hundreds lost their lives in the debris. Several ore mines collapsed killing dozens more. The areas of Chicago with the newest buildings are those areas that were damaged in the quake. The scientists have worked to develop a completely new and more quake resistant construction material that all new buildings are being made from. The mines have been re-dug, and shored up with more secure methods and refuges have been built into areas of the mines where trapped miners can take shelter in case of a collapse and use the telephones located there to call for help.[3]

In the immediate aftermath of the quake there was an outbreak of severe cold like symptoms. Nearly a hundred people were killed before it was brought under control. There have been no reports of the disease before or since.[3]

References & Contributors (Sources)[edit]

This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Far Future Enterprises or by permission of the author. The page history lists all of the contributions.