Crusader Kings III pulls off a difficult dual victory, bringing a new level of depth, charm, and polish to the franchise, while also making it far more approachable than before.
It is the sequel to Crusader Kings II which was released in 2012 and received content expansions until 2018 and then went free-to-play for the base game. The Northern Lords Flavor Pack is available for PC via Steam and the Paradox Store for $6.99 / £5.19. Crusader Kings 3 will kill your ass if you try that shit. Crusader Kings 3 is the best place to start.
Start as Holy Roman Emperor, a Viking king, a Byzantine noble, an Arab caliph or any of thousands of other possibilities. Hire mercenaries and Holy Orders for your major wars.
