This book deals with the category of converbs, whose denomination refers to a set of structures which cross-linguistically are not comparable. Specifically, we tackle the following topics: (1) converbs and related constructions as areal features, distinguishing between a general coordinating and subordinating type of converb; (2) converbs in the context of linguistic families, particularly in the Indo-European domain, displaying different non-finite structures to express the adverbial domain; (3) converbial constructions and competing construction types, (4) the diachronic typology of converbs and their source constructions.