Final answer:
Arthur Conan Doyle received knighthood for his services during the Boer War. Sherlock Holmes initially and mistakenly believes Dr. Grimesby Roylott killed Julia Stoner.
Step-by-step explanation:
Sir Arthur Conan Doyle received knighthood for his services during the Boer War. He served as a volunteer doctor in a field hospital and worked tirelessly to treat wounded soldiers. His efforts were recognized and he was knighted by King Edward VII in 1902.
In the Sherlock Holmes story 'The Adventure of the Speckled Band,' Sherlock initially and mistakenly believes that Dr. Grimesby Roylott, the stepfather of Julia Stoner, killed her. However, Holmes later discovers the true murderer.
Learn more about Knighthood and mistaken identity in Sherlock Holmes stories