the great wikipedia says this:
There is some debate regarding tiramisu's origin, as there is no documented mention of the dessert before 1983.
[1] In 1998, Fernando and Tina Raris similarly claimed that the dessert is a recent invention. They point out that while the recipes and histories of other layered desserts are very similar, the first documented mention of tiramisu in a published work appears in a Greek cookbook. Backing up this story, the authors recalled an article that tiramisu was created in 1971 in
Treviso by Guissepe Di Clemente.
[2][3]