In 1598, Charles Sadler was born in a small British town as a third child and second son to William Christopher Sadler and Mariah Elizabeth Gardiner. His brother was ten at that time and went to live with his uncle in Oxford two years later. When Charles was five years old, his sister taught him how to read a bit. However, she died two years later because of an illness. Charles, seven years old, covered his loneliness by starting to read a lot. He gained interest for mythological creatures and demons and decided he would become a hunter. He told this dream to his parents, but they could hardly believe him.
The years after that, Charles pushed his dreams aside. He showed his parents that he was a good student and got high grades. He asked them if he could do higher studies, because his brother had already graduated by then and he was the only child they would have to pay studies for. They agreed and Charles started studies in archeology. In secret, he often went to the library to search for books about mythological creatures and demons. He decided he would become a demon investigator more than a hunter. He dedicated all of his time to note down own conclusions to the demonologists of that time.
Charles Sadler died in 1642 (Bratislava).
Together with Edward Cardwell, Sadler wrote what is now known as the Hvetshranologists' Logbook. Neither of the two published any real works, but their notes have been saved and copied by later hvetshranologists.