The article aims to be an introduction to the dependency treebanks currently available for Ancient Greek and Latin, i.e., the Ancient Greek and Latin Dependency Treebank (AGLDT), the Index Thomisticus Treebank (IT-TB), the PROIEL Treebank, and the SEMATIA Treebank.Their pipelines for creation of morphosyntactic annotations are presented so as to highlight major commonalities and differences.All treebanks share the same basic underlying formalism, whereby syntactic words are connected to each other to form labeled directed acyclic graphs, and their annotation schemes, although different, are comparable to a very large extent. An introduction to the dependency treebank formalismA dependency treebank is a corpus containing a symbolic representation of the syntax of one or more texts.It can be defined as a set of sentences parsed according to the linguistic formalism of dependency grammar.Most treebanks for Ancient Greek and Latin, i.e., the Ancient Greek and Latin Dependency Treebank (AGLDT), the Index Thomisticus Treebank (IT-TB), the PROIEL Treebank, and the SEMATIA Treebank, are dependency treebanks.Even if, in the present article, I deal only with dependency treebanks, most of what follows in the present section could also be applied, mutatis mutandis, to describe constituency treebanks, such as the Nestle 1904 and SBNLGT Treebanks, 1 the major difference being that in dependency treebanks all nodes except the ROOT node are paired with tokens, 2 while in constituency treebanks nonterminal nodes, which represent phrases, such as VPs or PPs, are also licensed.The parsed sentences in a treebank are formally represented as labeled directed acyclic graphs, where each token, excluding the ROOT node, is annotated