West Iranian in historical perspective

Abstract The development of the Persian definitive object marker -rā from Old Persian rādī through Middle Persian benefactive rāy has been established as a model grammaticalization process by Bossong (1985) . His explanations on other modern Iranian languages, and their interplay in the historical development, have received far less research attention. This article offers a novel and comprehensive account of the historical development of -rā in West Iranian, from Old Persian up to approximately 20 New Iranian languages. Based on the semantic map model, it demonstrates that concerning -rā , most West Iranian languages can be subdivided into three typological groups, two of which represent more or less clearly defined genetic subgroups within the continuum of West Iranian. The interplay of genetic and typological/functional factors is complex, and open questions remain. The present study aims to provide empirical data, and to raise relevant questions, for future in-depth studies.