The Synoptic Gospels are the Gospels of Mark, Matthew and Luke. The word synoptic is Latin, derived from the Greek roots sun, meaning "with", and opsis, meaning "seeing". The sense of the word is therefore "seen together", as the three Gospels share so much of their content. Much of the material in Mark's Gospel, which is thought to be the earliest of the three, is expanded upon in Matthew and Luke. John's Gospel, in contrast, follows its own narrative. Biblical scholars have postulated the existence of an additional hypothetical Gospel account named Q (for the French word Quelle, meaning "source"), from which the authors of Mark, Matthew and Luke all drew some of their material.