Crusader Kings II Short
Released in 2012, Crusader Kings 2 is probably the most complicated and deep strategy game I've ever played. My personal aim was to conquer and found the Kingdom of Ireland and honestly after 30 hours and 6 new games I failed.
In my first attempt my Son was envious and wasn't super keen on me so I was murdered. This wouldn't have been to bad but I then took the role of my murderous son and everyone hated me which made managing court difficult.
My next play-through I married my heir off to a relative of King of England. A couple of generations later and I was a vassal to England and giving up all my counties to the King.
I also tried founding my own religion to more quickly invade my neighbours, but that only started a holy war with every nearby King.
Each playthrough you learn a new lesson and it's addictive. With each failure you want to adapt your strategy and push forward with new plans. It's a game that takes patience but is well worth it. You need to manage your family, vassals, council and religion to complete your personal objectives and ensure that it's your dynasty that thrives.
The game is available from
https://www.paradoxplaza.com/crusader-kings-ii/CKCK02GSK-MASTER.html