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Troubadour
A lot of times, writers will receive advice along the lines of: "if your setting is early-medieval, then you shouldn't include crossbows, because the technology would be out of place in your setting."
However, I think it's worthwhile to consider playing around with technology, mixing and matching from periods in a way that doesn't necessarily reflect real-world historical trends (but which, of course, remains plausible). After all--why should your world have gone through the exact classical-early medieval-high medieval-late medieval-early modern progression of the real world? Also, writers should feel free to re-locate technologies. India was producing high-quality steel ("wootz") as early as 500 BC, while other cultures struggled to make consistent or high-quality steel--but clearly the technology was not impossible for the time period. Similarly, blast furnaces (capable of melting iron) were present in China since at least the first century BC, and in ancient Tanzania from about the same time or perhaps slightly earlier.
In general, I find that people often forget the technological richness of the ancient world, despite its lack of advanced energy sources. For example, crossbows (of somewhat different design than high middle ages varieties) were actually employed from at least as early as the 5th century BC in Greece and China, eventually evolving into advanced siege weapons like the repeating ballista. And of course, there were domestic and agricultural inventions, such as: cement, flush toilets, indoor plumbing and hot water, sewage systems, aqueducts, dams, construction cranes, mechanical reapers, hydraulic mining, surgical techniques, medicinal preparations (in general, classical medicine was far superior to most medieval medicine), soap, tooth-fillings, and perhaps most importantly, salami.
Just because your world has serfs and knights and kings doesn't mean your people necessarily have to empty their chamber pots into the street, bathe once a month, and not understand the toxic effects of lead and mercury. The ancient world had diverse and often surprisingly modern technologies, and they can become effective plot and setting tools in establishing your own unique world.
However, I think it's worthwhile to consider playing around with technology, mixing and matching from periods in a way that doesn't necessarily reflect real-world historical trends (but which, of course, remains plausible). After all--why should your world have gone through the exact classical-early medieval-high medieval-late medieval-early modern progression of the real world? Also, writers should feel free to re-locate technologies. India was producing high-quality steel ("wootz") as early as 500 BC, while other cultures struggled to make consistent or high-quality steel--but clearly the technology was not impossible for the time period. Similarly, blast furnaces (capable of melting iron) were present in China since at least the first century BC, and in ancient Tanzania from about the same time or perhaps slightly earlier.
In general, I find that people often forget the technological richness of the ancient world, despite its lack of advanced energy sources. For example, crossbows (of somewhat different design than high middle ages varieties) were actually employed from at least as early as the 5th century BC in Greece and China, eventually evolving into advanced siege weapons like the repeating ballista. And of course, there were domestic and agricultural inventions, such as: cement, flush toilets, indoor plumbing and hot water, sewage systems, aqueducts, dams, construction cranes, mechanical reapers, hydraulic mining, surgical techniques, medicinal preparations (in general, classical medicine was far superior to most medieval medicine), soap, tooth-fillings, and perhaps most importantly, salami.
Just because your world has serfs and knights and kings doesn't mean your people necessarily have to empty their chamber pots into the street, bathe once a month, and not understand the toxic effects of lead and mercury. The ancient world had diverse and often surprisingly modern technologies, and they can become effective plot and setting tools in establishing your own unique world.