Sosaria Online — The worlds of Britannia Begin your journey
A sunlit Britannian harbor, sailing ships and a dragon above the castle towers

A return to Britannia

Your last destination
for Ultima Online.... begin your journey today!

The first steps beyond the city gates.
The friends, the danger, the freedom.
Find your way back to Sosaria.

Windows launcher · Version 1.1.5

OLD WORLDS. NEW STORIES.Explore
Adventure without a prescribed path.A world shaped by its players.A familiar place to begin again.

Choose your chapter

One Sosaria.
Different worlds.

From the earliest days of Britannia to a more unforgiving Renaissance. Each shard follows its own path. Which one will be yours?

The Original Age: an orange dragon and an armored warrior framed by the silver Ultima Online emblemI

THE ORIGINAL AGE 1998

An Corp

Britannia before The Second Age. A return to the origins of a world that let you choose your own way.

Pre-T2A
Renaissance: a blonde armored heroine with a blue cloak beneath the silver Ultima Online emblemII

RENAISSANCE 2000

Des Sanct

Classic Ultima Online in its Renaissance era. Explore Britannia, master a craft, and make your mark.

Classic Renaissance
A dragon watches over Britannia's castle wallsIII

RENAISSANCE SIEGE

In Nox

A Siege Perilous-inspired Renaissance shard. For those drawn to a harsher journey through the world.

Siege-inspired

These worlds are under active development. See realm details for client compatibility and availability.

The spirit of Sosaria

Some worlds
stay with you.

Take the long road. Learn a craft. Lose yourself beyond the safety of town. Sosaria Online brings together distinct eras of Ultima Online, with room for the stories that only players can tell.

Make your first steps

Your first steps

The gates are
closer than you think.

One launcher brings the supported clients together. Choose an era, prepare your client, and meet us in Britannia.

  1. 01

    Get the launcher

    Download the portable Windows launcher and extract it to a folder of your choice.

    Download details
  2. 02

    Choose your era

    Select The Original Age or Renaissance. Let the launcher download and verify the matching client files.

  3. 03

    Enter Britannia

    Launch the game. First time here? Sign in with a new username and password to create your account, then choose your shard.


From the journal

News from Britannia.

Development notes & realm updates

Your next chapter starts here

Welcome back
to Britannia.

The Sosaria Online launcher brings your worlds together.

Download for Windows

PORTABLE ZIP · VERSION 1.1.5 · WINDOWS

Requires the .NET 8 Desktop Runtime.

A few things to know

Which world should I choose?

Choose An Corp for the pre-T2A Original Age, Des Sanct for classic Renaissance, or In Nox for a Siege-inspired Renaissance experience. All three are under active development.

Do I need separate client installations?

The launcher manages separate era profiles and verifies their client files. An Corp uses The Original Age profile; Des Sanct and In Nox use Renaissance.

What about UOAssist?

The launcher includes compatible UOAssist choices for its era profiles. The Original Age offers 1.9.1 and its compatibility-adjusted 1.17.1 option; Renaissance uses its own 1.17.1 build.

How do I create an account?

Create your account in the game client: sign in with an available username and your chosen password. Account creation is limited to one account per IP address. Already registered? Use your existing credentials.

Are the shards online right now?

Open Realm status to see the latest game-port checks. Updates require the host status publisher; readings older than three minutes are marked stale. The in-game shard list remains the place to select a world.