Dionysius (ambassador)
Dionysius was a Greek of the 3rd century BCE, who was sent as ambassador to the court of the Indian emperor Ashoka, by Ptolemy Philadelphus.
He was preceded in this role by Megasthenes, ambassador to Chandragupta Maurya, and Deimachus, ambassador to his son, and father of Ashoka, Bindusara.
Dionysius is mentioned in a passage of Pliny the Elder: