Boyd’s Bible Dictionary:

People of Thessalonica, to whom Paul addressed two epistles, 13th and 14th N
T. books. The first was written at Corinth, A. D. 52 or 53, soon after the author had founded a church at Thessalonica, and upon the strength of favorable reports from Timothy. Its design was to confirm the new converts in the faith, strengthen them against persecution, correct their errors of doctrine and work, and inculcate purity of life. The second was also written from Corinth, soon after the first, and designed to correct false impressions concerning Christ’s advent, and especially to place the author right before the world as an authorized apostle and teacher.

Concise Bible Dictionary:

Jackson’s Dictionary of Scripture Proper Names:

victory over the tossing of law: victory over falsity