1) Crusader Stronghold
2) Crusader Stronghold 2
3) Civ V
4) Civ VI
5) Age of Empires
RTS for me, I've played some FPS games but they make me a bit giddy, like watching the Blair Witch car sickness horror flick.
I would point out that I'm generally a bit rubbish at these games so I tend to play the AI and virtually never play a human opponent and even on the easier settings I get whalloped by the computer.
I still enjoy it though, even if i rarely win.
I find it a good way to wind down after the kids are in bed and the Mrs has gone to watch some drivel like X-factor or Britains Got Braindead viewers that I find unpalatable.