Which of the following is NOT one of the three kingdoms of ancient Korea?

The Choson, or Joseon Dynasty, is not considered one of the three ancient kingdoms of Korea, which are Silla, Paekche, and Goguryeo (Koguryo). The three kingdoms existed from approximately the 1st century BC to the 7th century AD and played significant roles in the early history and cultural development of the Korean Peninsula.

The Silla Dynasty, known for its advanced culture and the unification of the peninsula with its counterpart kingdoms, along with Paekche and Goguryeo, are vital in understanding Korean history. The Joseon Dynasty, on the other hand, came later, from 1392 to 1910, marking a distinct period that followed the time of the three kingdoms. It is recognized for its contributions to Korean culture, governance, and Confucianism, but it does not belong to the early historical framework of the three kingdoms.