Ultima 1: The Original

The wizard Mondain, after his first defeat in Akalabeth, attacks Sosaria again with his hordes of evil and foul magic, threatening to crush the world beneath his heel.

Ultima is the first official game in the series, before it was known that there would be more than one installment). Ultima inspired many other RPGs of the early to mid-eighties, laying the foundation for a whole genre.