A man living in North Sumatra caught a large golden fish in his fishing trap. Surprisingly, the fish transformed into a beautiful princess. They fell in love and married, having a daughter. Years later, the man broke his promise to the princess by shouting that his daughter was the child of a fish after she ate his lunch. This caused a huge disaster - an earthquake and flooding that turned the area into Lake Toba and the man into the island of Samosir.