The four canonical gospels

There are four canonical gospels that have been ascribed to various individuals.  The Gospel of Matthew, from around 70-100 CE, was attributed to Matthew, the apostle.  The Gospel of Mark, from around 60-70 CE, was attributed to a companion of Peter called Mark.  The Gospel of Luke, from around 80-90 CE, was considered to be a traveling companion of Paul.  The Gospel of John, from the later 90-100 CE, was attributed to the apostle of Jesus named John.