The Stronghold Collection

Summary pulled directly from Steam - Some text may only be applicable to Steam platform

Enjoy the complete medieval experience in The Stronghold Collection, featuring five real-time strategy games. Create and defend your castle stronghold as you expand your lands, survey the castle life in your domain, host great jousting festivals and feasts, or conduct public executions to keep the peasantry in line.

Features
The ultimate medieval RTS package contains:

Stronghold: The original castle sim that started it all
Stronghold 2: The King, having fled after the defeat of his own armies, now attempts to rule his country from a secret location. Powerful barons now jostle for what is fast becoming a disintegrating kingdom – it is up to you to stem the tides of their ambition and unite the land under the king again!
Stronghold Crusader: Journey to distant Arabian lands renowned for brave warriors and fearsome weaponry as you lead a determined group of Crusaders. Now you have the chance to relive the historic Crusades in four campaigns as Richard the Lionheart and Saladin, the Sultan of Syria.
Stronghold Crusader Extreme: Extreme adds on 20 new missions, new buildings, and larger armies of 10,000 troops.
Stronghold Legends: Lead as fantasy characters throughout history: King Arthur and the forces of Camelot, Siegfried and Dietrich in the German Ice Campaign, and unleash the fury of the forces of evil in Vlad Dracul’s Transylvania.
Updated for Windows 7 and Vista compatibility