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xkcd #3129: Archaeology Research
(imgs.xkcd.com)
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Sounds like what Jorge Spräve (the slingshot guy on Youtube) did. He developed a mechanism that could be attached to any bow, with multiple arrows stored for rapid fire, draw assist, holds the string back at full draw, and has a trigger mechanism. Apart from the draw assist (which used slingshot bands), everything was theoretically producable during the middle ages, it just was never invented
This sounds suspiciously like a crossbow.
more like it attaches the quiver to the side of the longbow as a magazine to make the bow repeating. he did make one for the crossbow that is a lot more weildy though
edit: inventor and review/historical analysis. decide for urself what the wacky thing is