On the vanadium issue, what I've read of it so far points to vanadium being produced by making pig iron from magnetite, and then harvesting the vanadium from the slag in the form of an oxide, specifically vanadium pentoxide, which contains 20-24% vanadium. Then you can process that into ferrovanadium to increase the total amount of vanadium by mass in the finished resource. However this process requires using aluminum in the reaction, and while aluminum has been used in the ancient world, it was used as a chemical and not recognized as a metal, nor was the chemistry required to use it as a proper reactant known. So I don't think vanadium would be known to any of our nations except as rubbish leftover from smelting certain ores.