The analysis of Old Romance geographical names in early South Slavic confirms that the majority of late Proto-Slavic sound changes were still operative in the period of the earliest Old Romance-Slavic language contacts in the Balkan Peninsula and eastern Alps from the second half of the 6th century and the beginning of the 7th century onwards. Phonetic substitutions of the type Rom. *kE, *gE → Sl. *c, *ʒ (Balk. Rom. *Kersu → Sl. *Cersъ, Balk. Rom. *Gīla → Sl. *Ʒiĺa) and Rom. *auC → Sl. *ovC (Balk. Rom. *Laurentiu > *Laurenču → Sl. *Lovręčь) point to the fact that the first palatalization of velars as well as the monophthongization of the inherited diphthongs were no longer among the ongoing processes. All other late Proto-Slavic sound ch...