These include authorship and date of composition,  intention and genre,  gospel sources and oral tradition,   textual criticism,  and historical authenticity of specific sayings and narrative events. Luke, tradition ever spoke of them as posterior to St. Higgins Philadelphia: The remarks by Irenaeus represent the first mention of all four canonical gospels together. The Canonical Gospels 5.
John, etc; The use of the genitive case in the latter titles Paulou Epistolai, Apokalypsis Ioannouetc.
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In discussing the word "Theophilus," Strong's asserts that it is a single individual to whom Luke is addressing his gospel and Acts. Textual criticism deals with the identification and removal of transcription errors in the texts of manuscripts. Cassels, Walter. Astrotheology of the Ancients. Irenaeus, "Father of the Catholic Canon. Logos Research Systems, Inc. Leiden —9.