Siddhartha renounced his kingdom in search of 'truth'. But 'truth'
was not easy

to be found. He took to the life of an ascetic, like the one he
saw as the last of the Four Passing Sights. The ascetic, with
a peaceful face, inspired him most.During his search, he traveled
to distant lands. And for six years he lived as a solitary forest-dweller,
at first as the disciple of two renowned Hindu masters. Then,
after deciding he had learned all that they could teach him -
which he felt was not enough - he joined a band of ascetics and
with them he practiced such extreme austerities and ate so little
that he was about to die.
Study with the Hindus had not brought him the enlightenment he
was seeking, nor had his experiment with asceticism. Rejecting
self-indulgence as well as self-mortification, he determined to
follow what he called the Middle Path and to devote himself to
a course of mental cultivation and mystical concentration.In the town of Bodhgaya in Northeast India, Siddhartha sat down
beneath a tree to embark on an extended period of meditation.
And he determined not to rise until he had found the truth. For
49 days he meditated, formulating a body of wisdom which was to
bring mankind a new religion. When he arose he was enlightened,
he was the Buddha, ready to go forth and teach others how to become
enlightened.
The tree under which he meditated came to be known as the 'Bodhi
Tree', the tree of wisdom. And the place where this happened is
still known as Bodh Gaya, now in north eastern part of India.
It is believed that he attained nirvana on the day of the full
moon in the month of Vaishakha, or Vesakha. It became a great
Holy Day for the Buddhists. It was also on this day Buddha gave
his first sermon at Sarnath, also in the North Eastern India.This is why the Buddhists rotate the prayer wheels in the belief
the prayers written on the wheels get dispersed on this day. The
day when Prince Siddhartha became Gautam Buddha and again the
day when he gave his first sermon at Sarnath.
Soon after his enlightenment the Buddha preached to a small group
of the curious and those who heard his words became his disciples.
From then on the Buddha devoted the rest of his life to teaching
those who sought his advice, his compassion, his wisdom. The growth
in the number of his disciples led to his establishment of the
Sangha, the Buddhist monastic order. It was his disciples who
passed along his teachings, by word of mouth, from generation
to generation. Not until some considerable time after his death,
were the words of the Buddha recorded in written form.Finally
Buddha liberated himself from the cycle of rebirth and achieved
mahaparinirvana, also on the auspices of Vesak.