THADDAEUS (thă-dē'ŭs, Gr. Thaddaios). One of the twelve apostles, mentioned only twice in Scripture—in two of the four lists of the apostles (Matt.10.3; Mark.3.18). In Matt.10.3, KJV has “Lebbaeus, whose surname was Thaddaeus,” NEB has “Lebbaeus,” and NASB, NIV, and RSV have “Thaddaeus.” The other two lists (Luke.6.16; Acts.1.13) insert Judas, son of (or brother of) James instead of this name. Nothing else is certainly known about him, but he may be mentioned in John.14.22. A spurious “Gospel of Thaddaeus” used to exist.