Lionheart: Legacy of the Crusader - GoG Version
Game runs in 800x600 only and can be a little laggy at times, especially if there's a lot going on on the screen, or if magic spells are casted.
There is a widescreen patch out there which apparently works, but it increases the loading time significantly (from a few seconds to several minutes, and might not work at all).
Still if you want to try you can download the WideScreen Patch and follow the instructions in the Install.txt.
I personally would advice against it though.