A sequel to her widely used A Companion to Familia Romana (now in its second edition), Jeanne Marie Neumann's A Companion to Roma Aeterna offers a running commentary, in English, of the Latin grammar covered in Hans H. Ørberg's Roma Aeterna, and includes the complete text of the Ørberg ancillaries Grammatica Latina and Latin-English Vocabulary II. It also serves as a substitute for Ørberg's Instructions, on which it is based.