I had the same thought. Reading the Wikipedia page for the respective Italian law [1], it seems to me (but IANAL) that it would only apply to ownership of mate

I had the same thought. Reading the Wikipedia page for the respective Italian law [1], it seems to me (but IANAL) that it would only apply to ownership of material things, not apply to monetary claims. However, Italy also abolished all noble titles with the fall of the monarchy in 1946 -- I would have also expected that fiefs and any associated claims had been extinguished at the same time... [1]: https://it.wikipedia.org/wiki/Usucapione https://it.wikipedia.org/wiki/Usucapione