The region that is today known as Pakistan once had a large Buddhist population, with the majority of people in Gandhara (present day North Western Pakistan and Eastern Afghanistan) being Buddhist. Gandhara was largely Mahayana Buddhist, and was also a stronghold of Vajrayana Buddhism. The Swat Valley, known in antiquity as Uddiyana, was a kingdom tributary to Gandhara. There are many archaeological sites from the Buddhist era in Swat.