Why is the Perugia boundary stone important for understanding Etruscan law?

The boundary stone found at Perugia is significant to the study of the Etruscan language primarily because of its juridical content.1

While the majority of the more than 10,000 known Etruscan inscriptions consist of brief funerary or dedicatory formulas, the Perugia stone is one of the few remarkable exceptions that provides a longer, more complex text. Its importance lies in the fact that it offers rare insight into Etruscan legal terminology and administrative practices, which are otherwise difficult to reconstruct due to the lack of surviving literary works or comprehensive legal codes. By providing a sustained text of approximately 125 words, the stone serves as a vital resource for scholars employing the combinatory method—the internal analysis of grammatical forms and word recurrence—to better understand the structure and vocabulary of the language.21