it all started with the birth of Siddhartha. When Siddhartha was born it was predicted that he would become a king, therefore he was kept away from the outside world inside of a palace.
Siddhartha was born into a wealthy family sheltered from the reality of the world. He married a princess. Siddhartha wanted to know what the outside world was like so his father sent him on a trip but his father wanted him to avoid the sick and death.
while on this trip Siddhartha discovered the 3 sufferings and the truth about the outside world.
he saw sick people, people that were old, and saw dead people in the streets. when he asked about them he learned the truth about life.
as Siddhartha realized life was just endless suffering, he went on a journey to solve it so he left the palace, and on he went to practice with the aesthetic's he went as far as fasting.
as Siddhartha was at the point where he couldn't take it anymore he ate again and became healthy and sat under a tree and meditated until he found out the answer. after a long time, he finally understood the answer to suffering and became the buddha