We present an overview of the Index Thomisticus Treebank project (IT-TB). The ITTB consists of around 60,000 tokens from the Index Thomisticus by Roberto Busa SJ, an 11million-token Latin corpus of the texts by Thomas Aquinas. We briefly describe the annotation guidelines, shared with the Latin Dependency Treebank (LDT). The application of data-driven dependency parsers on IT-TB and LDT data is...