Four months later, the Prince set out for the royal garden on this Vejayanta chariot. Near the garden he saw the second ominous sight as created by the devas: an ailing man.
When he saw the man suffering from illness, he realized the misery of ailment, and returned to the palace.
Concepts and terminology:
Deva (De-va) : Celestial beings that are more powerful and live longer than human beings. They have angelic forms and possess maigical powers. They are not gods, and are neither omniscient, omnipotent, nor morally perfect. Link: Wikipedia