Apollonius Dyscolus was the first formal syntactician in Graeco-Roman linguistics. He considered the nature of language to be logical and rule-governed, and assumed an underlying structure for all levels of language. It might be said that from the work of his predecessors, he extracted syntax. This volume contains an English translation of - mainly - Uhlig's 1910 edition of De Constructione Libri Quattor (Peri Suntaxeos), with commentary, an introduction, and an article on Apollonius Dyscolus and the Origins of Deep Structure.