[8] Giuseppe Tucci states, on the authority of two Tibetan works - the Siddha (Wylie: grub thob) and Taranatha's "Possessing the Seven Transmissions" (Wylie: bka' babs bdun ldan) - that Matsyendranāth, who is seen in Tibet as an avatar of Avalokiteśvara, was a from Kaibarta or fishermen community of Kamarupa.

[2][3] According to inscriptions found in Nepal in the ancient Newari colony of Bungmati, the home of Machhindranath Chariot Jatra, his shrine was brought from Assam in India.

The fish swam to the bottom of the ocean where Shiva was imparting the secrets of yoga to his consort, Parvati.

[12] Other versions of the legend exist, including one in which Matsyendra was born as a fish and turned into a Siddha by Shiva.

[13] Tibetan renditions of the story tell of a fisherman-turned-Siddha named Mina, who is eaten by a fish while working in the Bay of Bengal.

[2] James Mallinson, Alexis Sanderson, David Gordon White and others theorize that many works were attributed to him posthumously.

The village of Bungamati, regarded in Nepal as the birthplace of Matsyendranath, is a traditional Newar town located 10 kilometres (6.2 mi) from downtown Kathmandu.

Each year, the locals of Patan, Lalitpur celebrate the festival in order to show respect to the rain god.

[16][27] It is celebrated just before the monsoon season starts so that the city will get plenty rainfall for good growth of crops.

During the procession, the image of Bunga Dyah is placed on a tall chariot about 65 feet high and pulled in stages through the streets of Patan for a month.

While these all are going to the temple premises, the chariot or ratha is made at Pulchowk by the Barahi and Yawal clans, amongst which one only does the rope work and other only the woodwork.

The route of the chariot procession starts at Pulchwok and passes through Gabahal, Sundhara, Lagankhel and ends at Jawalakhel.

During the ceremony, a government official holds up a jewel-studded black vest from the four sides of the chariot so that all the people gathered around can have a look at it.

[28] After the festival, the chariot is dismantled and Rato Macchindranath is taken to a temple in the nearby village of Bungamati, which is the first home of the rain god.

Parasnatha subdued kings of the world and turned egoistic, and was broken by Matsyendranatha's spiritual preachings.