Ο Sir Arthur Ignatius Conan Doyle (Sir Arthur Ignatius Conan Doyle, 1859-1930) was a British author, physician and one of the most important literary figures of the 19th and 20th centuries, best known as the creator of the detective Sherlock Holmes. He was born on 22 May 1859 in Edinburgh, Scotland. He studied medicine at the University of Edinburgh, where he came into contact with many of the scientific and social circles that influenced his work.

Conan Doyle ushered in a new era in crime fiction with the adventures of Sherlock Holmes, and his work has greatly influenced modern crime fiction. In addition to Holmes, he wrote historical novels, plays and essays. In the last years of his life he devoted himself to the study of spiritualism, arguing strongly for the existence of the afterlife.

Arthur Conan Doyle was a Freemason. He was initiated into the Lodge Phoenix Lodge No. 257 at Portsmouth on 26 January 1887, passed through the rank of Companion on 23 February 1887 and was raised to the highest office of Master Mason on 23 March 1887. Although his attendance was limited by his professional obligations, his Masonic principles of brotherhood and morality were in harmony with his personal convictions.

Later in his life, Conan Doyle focused more on spiritualism, which influenced his priorities and activities outside Freemasonry.

He died on 7 July 1930, leaving behind a rich legacy that influences literature and philosophy to this day.