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.[105] 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.