Knowing when something was written helps to better understand answers to other questions - like why it was written, and how it relates to other texts from that time. Unfortunately, ancient authors rarely wrote the date at the top of the page when they started writing, which makes working out when something was written a somewhat challenging process. Today, Dr. Bart Ehrman is going to guide us through how biblical scholars tackle this challenging process, and look at why it is that the Gospel of Mark is understood to be the first gospel.