Once upon a time , there was a man who named Toba lived around a ravine of Toba hill. Nobody knew when he arrived or where he came from. He lived in a small temporary hut on a farming area by the river, surrounded by an oval shaped hill. He was a fisherman. He also owned a garden. Once, he found a big fish in his woven rattan fish trap and it changed his life, in fact, he had never caught such a big fish before. It was an extra ordinary one. Then he put it in his hut and went out to think about how to cook it in a special way. After a little while, he went back to the hut. To his surprise, it was not an ordinary fish but a supernatural one. It had turned into a beautiful princess named Nauli. It is scales had changes in to beautiful jeweled ornaments and dresses fit for a princess. He then proposed to her, he asked her “will you be my wife” she nodded romantically.

The man was very happy. The princess said that she would like to get married to him but only with one condition. He should never tell any body that she had been a fish. The man agreed, she told hil that if he broken his promise that there would be tears and disaster.

Finally, they lived happily and harmoniously with their only daughter named Samosir. After the daughter grew up her mother always asked her to take her father’s lunch to him where he was out working in the fields. But unfortunately she was very greedy. Once , she ate up all the food that should have been given to her father. He was very angry when he saw her eating up all his food in the street. He shouted to her," you are rebellious. You are really the offspring of a fish". The princess heard the curse and felt that he had broken their agreement, arriving home the daughter asked her mother, who was crying about it. Without answering her daughter’s question, she asked her to go to a hill because there would be a disaster. After she had been praying for one minute there was an earthquake. Heavy rains fell down and springs came up from the ground. The place turned into Lake Toba and the hill into Samosir Island.