Herakleidies was a philosopher who is often associated with the early development of ideas in metaphysics and ethics. However, if you are referring to a specific event in mythology or historical context where something was placed on Herakleidies' chest, there may not be a widely recognized or significant occurrence.
If you're alluding to a particular story, object, or symbolism attached to Herakleidies or a similar figure, please provide more details or clarify the context so I can assist you better!