Konpira Gongen
Konpira Gongen (金毘羅権現) is a Japanese god of the Shugendō sect originating in the mountain Kotohira of Kagawa Prefecture. He is the god of merchant sailors. He is worshipped at 

According to legend  came into existence when a priest at  summoned the Ganges deity .

 was said to have been present at the preaching of the Mahāsamaya Sutta. He is a Ganges crocodile god.

He is identified with the first of the twelve spirit messengers emanating from Bhaisajyaguru.

Alongside many other water deities like Watatsumi, Sumiyoshi, Munakata-sanjojin, Ebisu, and Gozu Tennō his cult became very significant in medieval times.

Overview
Yoshida Kanetomo said that Susanoo, the Shinto god of sea and storms, is the same as the Indian god Khumbīra. This god watches over Vulture Peak, a place in Buddhist mythology...

As time passed, people in Japan began to see Konpira as a guardian of their Buddhist religion. They placed Konpira in a shrine on Zōzusan mountain in Shikoku. This mountain was very important for Shugendō followers by the end of the Heian period. Shugendō is a Japanese belief that combines mountain living, Shinto, and Buddhism. On this mountain, Konpira was given a new name, Konpira Gongen...

Associations 
Konpira is connected to gods of water, like dragons and nāga kings. These connections make him a protector of people at sea and the paths they take over the water. This is especially true for the waters inside Japan's coast. In a special part of Buddhism, people honor Konpira as one of twelve powerful spirit leaders. These leaders are linked to twelve directions and twelve animals from the Chinese calendar. Different stories match Konpira to different directions. But most often, he is linked to the north...

Sometimes Konpira is identified with gods like Ōkuninushi or Shinra Myōjin. ... But the most recent identification is with Ōmononushi. His identification with Ōmononushi may seem strange at first since Ōmononushi is a deity of mountains and snakes, while he is a water and navigatonal deity, but the logic behind it is that mountains are often used for navigation in the sea, so mountain deities help sailors..

In Literature 
A Buddhist text "Sange yōryakki" talks about Buddha placing twelve gods on Eagle Peak. One of these gods is Konpira. Here, Konpira is seen as a very important god in Japan. He is thought to be the divine child of Susanoo no Mikoto. People believed that a monk named Saichō came back safely from China because he prayed to Susanoo...

In later books, like "Jindai no maki kaden kikigaki" by Koretari, there are more stories. They say Susanoo visited not just Japan but also China and India. These stories suggest that the Japanese gods could be versions of Indian gods. This idea turns the usual story around, with Japanese gods being seen in other countries' stories...

Kotohira Shrines

 are a kind of shinto shrine in Japan. They were originally dedicated to the syncretic deity Konpira Gongen, but in the Meiji restorration due to Shinbutsu bunri they were dedicated to Ōmononushi. Their head shrine is Kotohira-gū.. They are dedicated to seafaring and protecting sailors.

They are part of the famous Inahachikonten Shrines (稲八金天神社)  of the Shrine Consolidation Policy alongside Inari Shrine, Hachiman Shrine, , and Tenmangu Shrine.

History 
According to legend  came into existence when a priest at  summoned the Ganges deity . styarting as a hostile sea monster the deity was placated and became a god of navigation. The deity is perceived as perhaps being a deification of a sea serpent called a wani.

Kotohira-gū is located close to and strongly historically associated with 

In 1889 due to the Meiji Restoration the head temple was renamed from Konpira temple to Kotohira-gu..

List of Kotohira Shrines

 Kotohira-gū
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Sapporo Hachimangū

See also
Shinbutsu-shūgō
Honji suijaku
Kotohira-gū
Emperor Sutoku

References 

Japanese religious terminology
Japanese gods
Gongen
Tengu
Vaiśravaṇa
Acala
Shinbutsu shūgō
Shinto shrines by tradition