This article is about the settlement within the radiation shield. You may be looking for the moon.
Sanctum was created to be a sanctuary for the human race.
Russell [src]

Sanctum is a self-governed sanctuary and a microstate within a radiation shield dome on the Alpha Moon. It was built to be a sanctuary for human race. The radiation shield protects Sanctum Citizens from intruders, dangerous lifeforms, adverse atmospheric conditions and celestial events, such as temporal flares on the moon. Sanctum was built by the first four families of astronomers, scientists, doctors and mechanics on Eligius III's Mission Team Alpha from Earth. These families, also known as the Primes, became the royal leaders of Sanctum. Sanctum is a safe, peaceful community, rich in traditions.


In 2045, the Eligius Corporation set out on a space mission to look for oil from other planets since Earth was running out of oil. Mission Team Alpha was sent to explore life on the moon Alpha. To prepare them for fatal radiation, the astronomers were turned into Nightbloods using Becca Franco's serum. They also used Becca's cybernetic implant technology known as the Memory Drives in order to keep log of their findings. Upon arriving on the moon, the atmosphere turned out to be survivable without Nightblood. They established a settlement to serve as their mission base. Josephine Lightbourne suggested calling the place "Sanctum" because it was safe and peaceful. The team brought with them a thousand embryos genetically-engineered with Nightblood to protect against solar radiation. The embryos were later used alongside the descendants of the team to create the settlement.

However, while the radiation was survivable, the moon was filled with other dangers such as enemies, hostile lifeforms, poisonous plants and atmospheric conditions such as temporal flares. To protect their settlement from these dangers, the astronomers used Becca's technology to build a radiation shield dome around their settlement. The shield has been critical in stopping bugs under eclipse-induced psychosis from entering the settlement. The region within the shield became Sanctum. Under the "divine" royal leadership of the Primes - the original four families. Since then, Sanctum has become a peaceful and safe place. Eventually, Gabriel Santiago rebelled and destroyed the remaining embryos in an attempt to avoid more resurrections, but Josephine Prime instated oblation to get rid of anyone who wasn't a potential host and was thus diluting the bloodline.

Sanctum lived without Earth contact until two centuries later when Clarke's group arrived on Eligius IV, seeking for shelter following Earth's third apocalyptic disaster. Following their arrival, a conflict broke out that led to the deaths of most of the Primes and the overthrow of their rule.


Tai Chi

Citizens of sanctum 603

The citizens are preforming Tai Chi.

As one of the traditions in Sanctum, many citizens are preforming Tai Chi.

Harvest Festival

Children of Gabriel - Harvest Festival

Harvest Festival

A Harvest Festival is where people begin to harvest the fields to collect crops. People are seen dancing during this festival.

Naming Day Ceremony

Main article: Naming Day
Naming Day in 604

Naming Day in Sanctum.

One of Sanctum's biggest traditions is Naming Day during which a person with Royal Blood (Nightblood) takes on the name of a Prime. Children born with royal blood are known as "hosts" and are protected until they reach the age of 21 to undergo this holy naming ceremony. For example, when Delilah becomes of age, Sanctum holds a naming ceremony for her, after which she becomes Priya VII.

The ceremony begins with parties and celebrations. This is followed by a repentance stage during which the people of Sanctum make amends with fellow Sanctum citizens. They then write their sins and float them away in lanterns. Once the repentance ceremony is over, the host is called to the stage for their official naming ritual. The host is asked to enter into a secret room. When the host comes back out later, they have not only the name but also the memories and personalities of the Prime they were being named after. They officially become a Prime, marking the end of their Naming Day Ceremony.

To the rest of Sanctum citizens, the Naming Day is a holy ceremony honoring the Primes. However, the reality is that the Primes have been manipulating them in order to bring their loved ones back to life, using the Royal Bloods as hosts. Each Prime has a Mind Drive which stores all their consciousness including memories and personalities. When a Prime dies, their consciousness is kept in the Mind Drive until there is an available host with royal blood. During the Naming Ceremony, the Primes use the Mind Drives to transfer the previously dead Prime's consciousness into the new host. In so-doing, the Prime comes back to life, using the host's body.

Death and Burial

When a Prime dies, the other Primes take out the Prime's Mind Drive from the host's body. They store it until there is another available Royal Blood to serve as a host for the Prime.

The funeral for Sanctum Citizens is considered to be a holy ritual during which the dead are offered to the woods.



Other Sanctum Citizens


Exiled Citizens



Sanctum Prime Palace 604

The Palace is where Sanctum's ruling royal family lived. It was formerly occupied by the Lightbourne family of Russell, Simone and their daughter, Josephine Lightbourne.

Outer Fields/Greenhouses

603 Farming area in Sanctum

The Outer fields surround the town. Greenhouses are located in these grass plains. The outer fields are used for growing crops and harvesting.

The Gagarin was landed in one of the outer fields until "Memento Mori".

Bar / Lounge / Tavern

Bar Lounge 608

This is the common hangout place in Sanctum that also has a bar for beverages. It seems to be a discussion place for Wonkru.

Machine Shop

604 motorcycle 1

The Machine Shop is a mechanical room where motorcycles are repaired. This is where Ryker spent most of his time. The reactor powering Sanctum is located beneath the machine shop.


6x01 Pre-School on Alpha 3

Sanctum has a school for young children. The pictures of the original Primes are displayed in the school. Madi Griffin later attends at the school.


Season Six
Episode Appearance Status
Red Sun RisingAppears
The Children of GabrielAppears
The Face Behind the GlassAppears
The Gospel of JosephineAppears
Memento MoriAppears
The Old Man and the AnomalyAppears
What You Take With YouMentioned
Ashes to AshesAppears
Adjustment ProtocolAppears
The Blood of SanctumAppears

Notes and Trivia

  • Sanctum is the Latin root of "sanctuary" which means safe, peaceful.
  • There are flags with the infinity symbol on it hanging around the place.
  • Sanctum is built upon a large hill/mountain.
  • Ryker's Keep is located under the mountain/hill.
  • In the episode called "Red Sun Rising", the blueprints in Russell Lightbourne's tent are used to create Sanctum.


  • Alpha Colony Primary Settlement
  • Farming area in Sanctum
  • Clarke in Sanctum.
  • Harvest fields in Sanctum.
  • Inside Sanctum's lab
  • Sanctum's lab inside the palace.
  • Sanctum at night
  • BTS - one of Sanctum's flags
  • Palace dining room
  • School
  • School
  • School
  • Tavern
  • Tavern
  • Palace dining room
  • Palace dining room
  • The Palace


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