The Syntactic Notarial Corpus of Medieval Asturian (CoNSAM-XIII) is a syntactic repository made up of 50 notarial deeds from the 13th century, kept in the Oviedo Cathedral Archive and the Avilés Municipal Archive. It enables us to search specific constructions and to select multiple variables simultaneously by combining linear and structural criteria. In order to create it free software tools and a syntactic annotation system (Magro, Galves y Carrilho, 2016) based on the standard Penn-Helsinki (Kroch y Taylor, 2000) have been used. This annotation system allows for queries and comparative studies among languages annotated according to the same standard by using the searcher CorpusSearch (Randall, 2005).