In historical linguistics, Italo-Celtic is a grouping of the Italic and Celtic branches of the Indo-European language family on the basis of features shared by these two branches and no others. These are usually considered to be innovations, which are likely to have developed after the breakup of Proto-Indo-European. It is also possible that some of these are not innovations, but shared conservative features. There is controversy about the actual causes of these similarities. What is commonly accepted is that the shared features may usefully be thought of as "Italo-Celtic forms".
The traditional interpretation of the data is that these two subgroups of the Indo-European language family are generally more closely related to each other than to the other Indo-European languages. This can be taken to imply that they are descended from a common ancestor, a phylogenetic Proto-Italo-Celtic which can be partly reconstructed by the comparative method. Those scholars who believe Proto-Italo-Celtic was an identifiable historical language usually estimate that it was spoken in the third or second millennium BC somewhere in south-central Europe. This hypothesis fell out of favour after being reexamined by Calvert Watkins in 1966. However some scholars, such as Frederik Kortlandt, continued to be interested in the theory. In 2002 a paper by Ringe, Warnow, & Taylor, employing computational methods as a supplement to the traditional linguistic subgrouping methodology, argued in favour of an Italo-Celtic subgroup, and in 2007 Kortlandt attempted a reconstruction of a Proto-Italo-Celtic.
The most common alternative interpretation is that a close areal proximity of Proto-Celtic and Proto-Italic over a longer period could have encouraged the parallel development of what were already quite separate languages. As Watkins (1966) puts it, "the community of -ī in Italic and Celtic is attributable to early contact, rather than to an original unity." The assumed period of language contact could then be later, perhaps continuing well into the first millennium BC.
However, if some of the forms are archaic elements of Proto-Indo-European that were lost in other branches, neither model of post-PIE relationship need be postulated. Italic and especially Celtic also share some archaic features with the Hittite language (Anatolian languages) and the Tocharian languages, and these features are certainly archaisms.
The principal Italo-Celtic forms are:
- the thematic Genitive in i (dominus, domini). Both in Italic (Popliosio Valesiosio, Lapis Satricanus) and in Celtic (Lepontic, Celtiberian -o), traces of the -osyo Genitive of Proto-Indo-European have also been discovered, which might indicate that the spread of the i-Genitive occurred in the two groups independently (or by areal diffusion). The i-Genitive has been compared to the so-called Cvi formation in Sanskrit, but that too is probably a comparatively late development. The phenomenon is probably related to the feminine long i stems (see Devi inflection) and the Luwian i-mutation.
- the ā-subjunctive. Both Italic and Celtic have a subjunctive descended from an earlier optative in -ā-. Such an optative is not known from other languages, but the suffix occurs in Balto-Slavic and Tocharian past tense formations, and possibly in Hittite -ahh-.
- the collapsing of the PIE aorist and perfect into a single past tense. In both groups, this is a relatively late development of the proto-languages, possibly dating to the time of "Italo-Celtic" language contact.
- the assimilation of *p to a following *kʷ. This development obviously predates the Celtic loss of *p:
- PIE *penkʷe 'five' → Latin quinque; Old Irish cóic
- PIE *perkʷu- 'oak' → Latin quercus; Goidelic ethnonym Querni, In nw. Hispania Querquerni.
- PIE *pekʷ- 'cook' → Latin coquere; Welsh pobi (Welsh p presupposes Proto-Celtic *kʷ)
Other similarities include the fact that certain common words, such as the words for common metals (gold, silver, tin, etc.) are similar in Italic and Celtic yet divergent from other Indo-European languages. A number of other similarities continue to be pointed out and debated.
The r-passive (mediopassive) was initially thought to be an innovation restricted to Italo-Celtic until it was found to be a retained archaism shared with Hittite, Tocharian, and possibly Phrygian.
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- Watkins, Calvert, “Italo-Celtic Revisited”. In: Birnbaum, Henrik; Puhvel, Jaan eds. (1966). Ancient Indo-European dialects. Berkeley: University of California Press. pp. 29–50. OCLC 716409.
- Kortlandt, Frederik H .H., "More Evidence for Italo-Celtic", in Ériu 32 (1981): 1-22.
- Ringe, Donald; Warnow, Tandy; Taylor, Anne (March 2002). "Indo-European and Computational Cladistics". Transactions of the Philological Society (Oxford: Blackwell Publishing) 100 (1): 59–129. doi:10.1111/1467-968X.00091. ISSN 0079-1636. OCLC 195112762. BL Shelfmark 8993.670000. Retrieved 2008-03-13.
- Kortlandt, Frederik H .H., Italo-Celtic Origins and Prehistoric Development of the Irish Language, Leiden Studies in Indo-European Vol. 14, Rodopi 2007, ISBN 978-90-420-2177-8.
- Nils M. Holmer, "A Celtic-Hittite Correspondence", in Ériu 21 (1969): 23-24.
- Andrew L. Sihler, New Comparative Grammar of Greek and Latin, OUP 1995, p.145, §141.
- Michael Weiss, Italo-Celtica: Linguistic and Cultural Points of Contact between Italic and Celtic in Proceedings of the 23rd Annual UCLA Indo-European Conference, Hempen Verlag 2012
- Jay Jasanoff, "An Italo-Celtic isogloss: the 3 pl. mediopassive in *-ntro," in D. Q. Adams (ed.), Festschrift for Eric P. Hamp. Volume I (= Journal of Indo-European Studies Monograph 23) (Washington, D.C., 1997): 146-161.
- Winfred P. Lehmann, "Frozen Residues and Relative Dating", in Varia on the Indo-European Past: Papers in Memory of Marija Gimbutas, eds. Miriam Robbins Dexter and Edgar C. Polomé. Washington D.C.: Institute for the Study of Man, 1997. pp. 223–46
- Winfred P. Lehmann, "Early Celtic among the Indo-European dialects", in Zeitschrift für celtische Philologie 49-50, Issue 1 (1997): 440-54.
- Schmidt, Karl Horst, “Contributions from New Data to the Reconstruction of the Proto-Language”. In: Polomé, Edgar; Winter, Werner eds. (1992). Reconstructing Languages and Cultures (1st ed.). Berlin, New York: Mouton de Gruyter. pp. 35–62. ISBN 3-11-012671-0. OCLC 25009339.