I got 2 that have plagued me for a long time. I think I found one of them, the first one, but wasn't too sure about it then I forgot what it was called so:
Both Spectrum games. Possibly released on similar era consoles (C64, etc).
1. You played a wizard, witch, apprentice, or something like that. You hopped around a Dizzy-esque landscape including (and possibly limited to) a castle, picking up various items. You talked to little dragons, too. Game played kind of like a faster paced Dizzy.
2. Man, this is impossible to describe. You either played as, or were featured on the front cover as a white knight with Romanesque wing motifs on your boots. All I remember is that you ran (or walked) to the right in a dank castle tunnel setting. That's it. I have no clue what the aim was or anything like that. Good luck finding this one!