Games like Little Kingdoms
Games like Little Kingdoms include Crusader Kings III, Mount & Blade II: Bannerlord, Mount & Blade: Warband, Crusader Kings II, and Kenshi. We matched them by the tags players give Little Kingdoms on Steam (Medieval, Strategy, Real-Time, Point & Click, and RPG): closest matches first, and among equally close ones the better-known games.

Crusader Kings III
Shared: Medieval · Strategy · RPG

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

Mount & Blade: Warband
Shared: Medieval · Strategy · RPG

Crusader Kings II
Shared: Strategy · Medieval · Grand Strategy

Kenshi
Shared: RPG · Strategy RPG · Sandbox

Manor Lords
Shared: Strategy · Grand Strategy · Management

Wartales
Shared: Medieval · RPG · Strategy

Mount & Blade
Shared: Medieval · Strategy · RPG

Foundation
Shared: Medieval · Strategy · Management

Total War: WARHAMMER
Shared: Strategy · RPG · Grand Strategy

The Scroll of Taiwu : Beyond The Dome
Shared: RPG · Strategy · Sandbox

Gladiator Guild Manager
Shared: Strategy · Medieval · RPG

Stellaris
Shared: Strategy · Grand Strategy · 4X

Heroes of Might and Magic: Olden Era
Shared: Strategy · RPG · Grand Strategy

Mount & Blade: With Fire & Sword
Shared: Medieval · RPG · Strategy

Knights of Honor II: Sovereign
Shared: Strategy · Medieval · Grand Strategy

Battle Brothers
Shared: Strategy · RPG · Grand Strategy

Game Dev Tycoon
Shared: Strategy · Management · Indie

Yes, Your Grace
Shared: Medieval · RPG · Management

Sands of Salzaar
Shared: Strategy · RPG · Open World

Against the Storm
Shared: Strategy · Management · Grand Strategy

RimWorld
Shared: Strategy · Management · Sandbox

The Guild 3
Shared: Medieval · Strategy · RPG

Age of Empires II (Retired)
Shared: Strategy · Medieval · Real-Time