Games like MediAevi
Games like MediAevi include Banished, Prison Architect, Oxygen Not Included, RimWorld, and Foundation. We matched them by the tags players give MediAevi on Steam (Colony Sim, Simulation, Strategy, Fantasy, and Medieval): closest matches first, and among equally close ones the better-known games.

Banished
Shared: Colony Sim · Strategy · Simulation

Prison Architect
Shared: Simulation · Colony Sim · Strategy

Oxygen Not Included
Shared: Colony Sim · Simulation · 2D

RimWorld
Shared: Colony Sim · Strategy · Simulation

Foundation
Shared: Simulation · Strategy · Medieval

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Sandbox

Potion Craft: Alchemist Simulator
Shared: Simulation · Medieval · 2D

Mount & Blade II: Bannerlord
Shared: Strategy · Medieval · Simulation

Life is Feudal: Forest Village
Shared: Colony Sim · Strategy · Simulation

Kingdoms and Castles
Shared: Colony Sim · Simulation · Strategy

Dwarf Fortress
Shared: Colony Sim · Simulation · Strategy

Amazing Cultivation Simulator
Shared: Simulation · Strategy · Colony Sim

Songs of Syx
Shared: Colony Sim · Strategy · Sandbox

WorldBox - God Simulator
Shared: Simulation · Colony Sim · Sandbox

Dawn of Man
Shared: Colony Sim · Strategy · Simulation

Gnomoria
Shared: Colony Sim · Strategy · Simulation

Reus
Shared: Strategy · Simulation · Indie

Game Dev Tycoon
Shared: Simulation · Strategy · Indie

Craft The World
Shared: Colony Sim · Strategy · Sandbox

Ultimate Epic Battle Simulator
Shared: Simulation · Strategy · Sandbox

Lessaria: Fantasy Kingdom Sim
Shared: Strategy · Simulation · Colony Sim

Crusader Kings III
Shared: Strategy · Simulation · Medieval

Manor Lords
Shared: Strategy · Simulation · Colony Sim

Tavern Master
Shared: Simulation · Medieval · Strategy