For me, it’s the Polish-Lithuanian Commonwealth (or a period shortly after it disappeared):
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Brutal forays on noble estates. These were the highlight of Polish-Lithuanian Commonwealth (these were either done legally, or not).
Foray - Wikipedia -
Foray could be a perfect set up for a revenge story.
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Variety of possible enemies for gameplay purposes: Cossacks, Germans, Russians, Swedes.
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Robber barons were common
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Thus there would be bandits to fight
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Noble chicks to romance
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Variety of noble families with often complicated ancient rivalry between them - so there could be a mechanic for choosing who to side with. And it’s just a decent inspiration for a story thread
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Diverse fauna and a rich hunting culture among nobles - hunting mechanics
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Very flashy fighting techniques like cross art were common - https://youtu.be/TEwOmdnX50s?t=69 . This could make the gameplay look appealing
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Variety of weaponary - sabres, pistols, bows, crossbows, rapiers, longswords - this variety would be great for gameplay, but would be kind of hard to implement due to all the animation work required