Rastan (Rastan Saga in Japan) is a horizontal scrolling action platformer from Taito, released in 1987. In it, the barbarian Rastan (much like other barbarians with names ending in -an) must travel across the land and ultimately defeat a dragon.
It features immersive graphics and level designs (the day-night transition takes place as Rastan progresses through the levels), great music, and engaging gameplay.
I have recently obtained the arcade PCB (standard JAMMA) and took a few photos. The board was accidentally oversprayed with paint, but plays flawlessly.
Click on the photos below for higher-resolution versions.