Which was written first: the Gospel of Mark or the Gospel of Matthew?
Virtually impossible to know. The myth is that Matthew was written first, but if you want to really examine the history behind the gospels, you might find the excerpt interesting: < There is so much evidence that the Gospels were written in the Second Century that it’s hard to believe that the vast majority of scholars still stick stubbornly to the belief that they are a First Century production. The earliest known Christian writings are the letters of the Apostle Paul, dated sometime between 48 and 58 A.D.; but there are no copies of these original documents [1], and there are many questions about their authenticity [2]. Some people believe that the earliest versions of the four Gospels were written between 60 A.D. (Mark) and 100 A.D. (John), but there is no proof of these early dates, and some scholars believe that all the Gospels were written after 100 A.D. (e.g., Acharya, 1999; Ellegard, 1999; Keeler, 1965; Koester, 1980; Wheless, 1990). Here is some evidence to support this theory