Just to ward off any wrong impression - Ars Magica can certainly be high magic, and may indeed by more high magic than you want (especially with everyone playing wizards and all), but much of the setting is very low-magic. For example, one of the recent supplements is City & Guild. Consider its blurb, and how that translates to the kind of games its intended to support:dungeon blaster said:Thanks for all the great replies! Harn and Ars Magica sound like they might work, although Ars Magica might be too "high magic" for my purposes. I'll have to check them out further.
A saga placed in a city and centered around trade and city politics would hardly be high-magic, and these kind of "adventures" are certainly part of the milieu of the game.City & Guild
In the thirteenth century towns and cities are growing all over Mythic Europe. Covenants that were once in remote forests find themselves within sight of city walls, and regions that were once cut off from the world are now visited by traders from distant parts. For many covenants, cities are a great opportunity; craftsmen and merchants can provide anything that the covenant needs, and buy its surplus. Some covenants are even established within towns, or as small towns.
This supplement for Ars Magica Fifth Edition provides background on the facts of life in the towns of medieval Europe, and rules for craftsmen and traders. Clever magi could become the greatest merchant princes of Europe, or gain renown as suppliers of the most valuable tapestries. Less clever magi could find themselves manipulated by existing merchant princes, or tricked into buying shoddy goods. With an emphasis on stories rather than accountancy, this book opens a new stage for your Ars Magica saga.
dungeon blaster said:How's the melee combat system for Ars Magica? Any good? Or is it totally secondary to the magic combat system?
I took a brief look around the web for Harn material, but it is all quite fragmented. Not sure what is official and what isn't. Also looks kind of expensive.
dungeon blaster said:...that mixes fantasy with real medieval history. Or at least patterns itself after the real world.
Something with a conan-esque flavor, but real world locations?
Does this exist?
GrumpyOldMan said:Hârn is my world of choice, so I’m more than a little biased, though certainly no more than Nightfall.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.