Four of the letters (Ephesians, 1 and 2 Timothy and Titus) are widely considered pseudepigraphical, while the authorship of the other two is subject to debate. Colossians and 2  Thessalonians are possibly "Deutero-Pauline" meaning they may have been written by Paul's followers after his death. Similarly, 1  Timothy, 2  Timothy, and Titus may be "Trito-Pauline" meaning they may have been written by members of the Pauline school a generation after his death. According to their theories, these disputed letters may have come from followers writing in Paul's name, often using material from his surviving letters. These scribes also may have had access to letters written by Paul that no longer survive.