When did the Loch Ness Monster first appear?

Answer 1

The earliest report of a monster associated with the vicinity of Loch Ness appears in the Life of St. Columba by Adomnán, written sometime during the 7th century.[13] According to Adomnán, writing about a century after the events he described, the Irish monk Saint Columba was staying in the land of the Picts with his companions when he came across the locals burying a man by the River Ness. They explained that the man had been swimming the river when he was attacked by a "water beast" that had mauled him and dragged him under. They tried to rescue him in a boat, but were able only to drag up his corpse. Hearing this, Columba stunned the Picts by sending his follower Luigne moccu Min to swim across the river. The beast came after him, but Columba made the sign of the cross and commanded: "Go no further. Do not touch the man. Go back at once."[14] The beast immediately halted as if it had been "pulled back with ropes" and fled in terror, and both Columba's men and the pagan Picts praised God for the miracle.[14] Believers in the Loch Ness Monster often point to this story, which notably takes place on the River Ness rather than the loch itself, as evidence for the creature's existence as early as the 6th century.[15] However, skeptics question the narrative's reliability, noting that water-beast stories were extremely common in medieval saints' Lives; as such, Adomnán's tale is likely a recycling of a common motif attached to a local landmark.[16] According to the skeptics, Adomnán's story may be independent of the modern Loch Ness Monster legend entirely, only becoming attached to it in retrospect by believers seeking to bolster their claims.[15] Additionally, in an article for Cryptozoology, A. C. Thomas notes that even if there were some truth to the story, it could be explained rationally as an encounter with a walrus or similar creature that had gotten up the river.[15]

Answer 2

Well it has no tyet been proven that the monster exsists but people have believed there was somethig in that loch since the year 563 just after the middle ages began.