Games like Warlord: Britannia
Games like Warlord: Britannia include Mount & Blade II: Bannerlord, Mount & Blade: Warband, Grand Theft Auto V Legacy, Satisfactory, and Kingdom Come: Deliverance II. We matched them by the tags players give Warlord: Britannia on Steam (Open World, Strategy, Base Building, Rome, and Historical): closest matches first, and among equally close ones the better-known games.
Mount & Blade II: Bannerlord
Shared: Strategy · Open World · Action
Mount & Blade: Warband
Shared: Open World · Strategy · Action
Grand Theft Auto V Legacy
Shared: Open World · Action · First-Person
Satisfactory
Shared: Open World · Base Building · Sandbox
Kingdom Come: Deliverance II
Shared: Open World · First-Person · Historical
Sons Of The Forest
Shared: Open World · Base Building · First-Person
Once Human
Shared: Open World · Action · Base Building
Manor Lords
Shared: Strategy · Base Building · Historical
ARK: Survival Ascended
Shared: Open World · Base Building · Adventure
Kingdom Come: Deliverance
Shared: Open World · Historical · First-Person
Mount & Blade: With Fire & Sword
Shared: Open World · Strategy · Historical
Factorio
Shared: Base Building · Strategy · Open World
Fallout 4
Shared: Open World · Adventure · First-Person
ARK: Survival Evolved
Shared: Open World · Base Building · Adventure
The Last Caretaker
Shared: Base Building · Open World · First-Person
The Long Dark
Shared: Open World · First-Person · Adventure
Warlord: Awaji
Shared: Strategy · Open World · Historical
RimWorld
Shared: Base Building · Strategy · Sandbox
Sands of Salzaar
Shared: Open World · Strategy · Indie
Ghost of Tsushima DIRECTOR'S CUT
Shared: Open World · Action · Adventure
Freeman: Guerrilla Warfare
Shared: Strategy · Open World · Action
The Forest
Shared: Open World · Adventure · First-Person
Green Hell
Shared: Open World · Base Building · Action
Mount & Blade
Shared: Open World · Strategy · Action