The Pauline letters are the thirteen New Testament books that present Paul the Apostle as their author. Paul's authorship of six of the letters is disputed. Four are thought by most modern scholars to be pseudepigraphic, i.e., not actually written by Paul even if attributed to him within the letters themselves. Opinion is more divided on the other two disputed letters (2 Thessalonians and Colossians). These letters were written to Christian communities in specific cities or geographical regions, often to address issues faced by that particular community. Prominent themes include the relationship both to broader "pagan" society, to Judaism, and to other Christians.