1. The Buddha in Fact: As Seen in the Lens of 'Study of the Biography of Sakyamuni'
2. Monograph No. 16
3. The days of Sakyamuni's birth, enlightenment and death
4. The Saṃgha
5. The organization of the Roman Catholic Order
6. The "Saṃgha led by the Buddha" (sammukhībhūta-saṃgha) and "Saṃghas of the four directions" (cātuddisa-saṃgha)
7. Questions and answers between Ānanda and Sakyamuni and between Devadatta and Sakyamuni
8. Circumstantial evidence for the existence the Sakyamuni's Saṃgha
9. The organization of "Sakyamuni's Saṃgha"
10. Rights given by the "Saṃghas led by the Buddha's disciples"
11. Unifier(s) of Sakyamuni's Saṃgha
12. The system unifying Sakyamuni's Saṃgha
13. The moment "Sakyamuni's Saṃgha" was revealed
14. Why was "Sakyamuni's Saṃgha" such a loose organization?
15. Buddhist practitioners of the earliest period as described by scholars of Buddhism, and the truth
16. Theravada Buddhism - the direct disciples of Gotama Buddha

Since this lecture is associated with the festival of Vesak, which celebrates the Buddha's birth, enlightenment and death on the one day, I have taken as my topic why the traditions about these days are different in Theravada Buddhism and Japanese Buddhism. And as my subtheme, "Did Sakyamuni's Saṃgha actually exist?" shows, I suggest that what we should call "Sakyamuni's Saṃgha," a group comprising all ordained Buddhist practitioners of the Saṃgha and all ordained followers in various places, did exist, and I discuss what form it may have taken, and through this, consider the characteristics of Theravada Buddhism.