The object of this study is the case marking of the subject inearly medieval Latin. The study is based on a treebank of Latin charters from Italy. The purpose is to examine whether and how the nominative/accusative-type morphosyntactic alignment changed into a semantically-motivated (active/inactive) alignment in Late Latin before the disappearance of the case system. This kind of evolutionary development has been suggested by previous research. The study will be carried out by analysing the distributions of the two ayntactic cases, the nominative and the accusative.