Mark is believed to be the earliest gospel written around 60-70 AD in Rome. It was likely written by John Mark, an interpreter of the apostle Peter. The author aimed to encourage Roman Christians facing persecution by emphasizing Jesus' suffering. Key themes are the kingdom of God and its presence in Jesus' works. Jesus is portrayed as a man of action who conceals his identity. Disciples are depicted as ignorant. Stories are linked through repetition of words and sandwiching smaller stories within larger ones.