Ok, this isn't at all medieval - even back then they knew the world was round - but this has to be one of the most incredible cakes I've ever seen.
Of course they did use marzipan and sugar paste to make edible sculptures in the middle ages. Such sculptures were often referred to as "sotlties" or "entrements". Unfortunately I've seen very few attempts by medieval re-creationists that approach this level of intricacy or artistic skill (and the tree of butterflies I made some time back out of sugar paste pales in comparison).
I am so in awe of this artist.