From the introduction:
Welcome to The Free City of Oceansend, the ninth entry in the popular fan-made line of gazetteers describing the world of Mystara – the only game world designed for the classic box-set series of Dungeons & Dragons™ by TSR/Wizards of the Coast™.
The Free City of Oceansend continues the Norwold-cycle of gazetteers, which highlight the geopolitics between established powers (the Thyatian and Alphatian Empires) and newcomers (the Heldannic Order, Ericall).
In addition to the standard features of the Gazetteers, this product provides optional information for the operation and upkeep of mercenary units that are compatible with the rules for dominion rulership. This includes a glossary of common terms from military history and an overview of negotiating a contract.
I hope you enjoy reading The Free City of Oceansend and using it in your own campaigns.