Reference question (Was: Filliozat)

[O. Freiberger]

Y.R. Rani (Yvette C. Rosser?) wrote:

>There were also Buddhist missionaries who visited Greece, Egypt and other
>countries in the Mediterranean area.  One such visit is documented as late
>as 20 BCE in Athens.  In this account an ambassador from India was
>accompanied by a Buddhist philosopher who immolated himself (to prove some
>point of impermanence?). 

Could you please give the textual source for this information? This very early
date of a recorded visit is new to me.

Oliver