Robert Langdon is a fictional character created by author Dan Brown. He is a Harvard symbologist and religious iconologist known for his expertise in deciphering symbols and codes. Langdon often finds himself embroiled in thrilling adventures that involve historical mysteries and secret societies. Throughout the Robert Langdon series, he navigates complex plots that intertwine art, history, and religion. His notable appearances include novels like The Da Vinci Code, Angels & Demons, and Inferno. Langdon's character is characterized by his intelligence, curiosity, and a strong moral compass, making him a compelling protagonist.