This volume is an important contribution to the diachrony of non-canonical subjects in a typological perspective. The questions addressed concern the internal mechanisms and triggers for various changes that non-canonical subjects undergo, ranging from semantic motivations to purely structural explanations. The discussion encompasses the whole life-cycle of non-canonical subjects: from their emergence out of non-subject arguments to their expansion, demise or canonicization, focusing primarily on syntactic changes and changes in case-marking. The volume offers a number of different case...