*Disclaimer* I am not a linguist by any means. My lack of understanding of Pali, Greek, and possibly English validates any grain of salt thrown at this post. Put your Skeptics hat on, my friends.
Around 250 BCE, the Third Buddhist Council convened under the patronage of Asoka, emperor of the pan-Indian Mauryan empire. The council’s purpose was to expunge the heretical and false, including both the views of dhamma and monastics. The council compiled the teachings and rules that would be considered the “teachings of the Elders”, Theravada.¹
These missionairies would have been called the Sons of the Elders, Theraputta. Although there is little record, Asoka claims to have reached Egypt and Greece with the dhamma.