Hiccup Horrendous Haddock III, known as the 'Dragon Whisperer', played a significant role in the history of dragons on Earth. In the 'How to Train Your Dragon' book series, Hiccup is portrayed as a young Viking who has a unique ability to communicate with dragons. This ability allowed him to establish a harmonious relationship between humans and dragons, which was a stark contrast to the previous conflicts. However, the disappearance of dragons from Earth is not directly linked to Hiccup. The series suggests that dragons went into hiding, but it doesn't explicitly state that Hiccup was responsible for their disappearance.