The order in which these events took place are as follow:
1) Siddhartha is Hindu prince
2) Siddhartha sees sickness, old age, death
3) Siddhartha sees a holy man
4) Siddhartha becomes religious seeker and ascetic
5) Siddhartha meditates under Bodhi Tree
6) Siddhartha finds enlightenment
Buddha which is the title of Siddhartha lived a luxurious life away from pain and suffering as a prince until one day he toured the city where he first witnessed the four sights mentioned above. This turned his life and he started seeking after the real truth “Nirvana”. His journey is a long and full of trials by Satan but finally he finds enlightenment.