Background
Gilii was born in Legogne, Italy (Umbria region).
Gilii was born in Legogne, Italy (Umbria region).
Gilii is a highly celebrated figure in early South American linguistics due to his advanced insights into the nature of languages. Most of what is known about the ethnology of the Tamanaco Indians was recorded by Gilii. Gilii recognized sound correspondences (eg between /s/: /tʃ/: /ʃ/ in the Cariban family) and predated William Jones" third discourse suggesting genealogical relationships between languages.
Unlike Jones, Gilii presented evidence in support of his hypothesis.
He also discussed major concepts of linguistics such as areal features between unrelated languages, loanwords (among American languages and from American languages into European languages), word order, language death, language origins, and nursery forms of child language (ie Lallwörter) discussed by Roman Jakobson. Gilii"s nine lenguas matrices
Gilii found that the languages spoken in the Orinoco area belonged to nine "mother languages" (lenguas matrices), id est (that is) language families:
Caribe (Cariban)
Sáliva (Salivan)
Maipure (Maipurean)
Otomaca & Taparíta (Otomacoan)
Guama & Quaquáro (Guamo)
Guahiba (Guajiboan)
Yaruro
Guaraúno (Waroa)
Aruáco (Arhuacan)
This classification is one of the earliest proposals of South American language families.