Why is Hittite important for the study of Indo-European languages?

Hittite is of paramount importance to the study of Indo-European languages primarily because it preserves the earliest written evidence of any Indo-European language.12

Its significance lies in several key areas:

• Laryngeal Theory: In 1927, linguist Jerzy Kuryłowicz demonstrated that the Hittite consonant h(h) provided direct, empirical evidence for the "laryngeal" consonants previously hypothesized by Ferdinand de Saussure in 1879. This discovery validated theoretical reconstructions of the Proto-Indo-European sound system.3
• Structural Insights: Hittite has been essential for understanding the grammar and structure of the Proto-Indo-European parent language. Its noun and verb endings were instrumental in Bedřich Hrozný’s 1915 identification of the language as Indo-European.1
• Classification: As the most prominent member of the Anatolian languages, Hittite is central to the debate regarding the evolution of the language family. Some scholars propose an "Indo-Hittite" model, suggesting that Anatolian branched off from the parent language earlier than other Indo-European branches.4

By providing a window into an ancient stage of linguistic development, Hittite remains a cornerstone for reconstructing the history and phonology of the entire Indo-European family.13