Gday smartcooky,
Thanks for your reply
Hard to say when the Gospels were WRITTEN (and 30CE for G.Mark is indeed ridiculously early,) but it seems a lot clearer when they finally became widely known to Christians - about mid 2nd C. :
Christian Books by Decade - Gospel mentions
<50s>
Paul - NO Gospel mentions
<60s>
Hebrews - NO Gospel mentions
<80s>
Colossians - NO Gospel mentions
1 John - NO Gospel mentions
James - NO Gospel mentions
<90s>
Ephesians - NO Gospel mentions
2 Thess. - NO Gospel mentions
1 Peter - NO Gospel mentions
1 Clement - NO Gospel mentions
Revelation - NO Gospel mentions
<100s>
The Didakhe - NO Gospel mentions
Jude - NO Gospel mentions
<110s>
Barnabas - NO Gospel mentions
<120s>
2 John - NO Gospel mentions
3 John - NO Gospel mentions
G.Thomas - NO Gospel mentions
<130s>
Papias - mentions 2 writings, not called Gospels yet
2 Peter - NO Gospel mentions
The Pastorals - NO Gospel mentions
G.Peter - NO Gospel mentions
<140s>
to Diognetus - NO Gospel mentions
Ep.Apostles - NO Gospel mentions
2 Clement - NO Gospel mentions
Aristides -
calls the singular Gospel newly preached in 138-161CE
<150s>
Justin refers to "memoirs of the apostles" which are "also called Gospels". But he gives no names, and his quotes are not identical to modern Gospels.
After that, everyone know and quotes and mentions the Gospels endlessly.
It seems pretty clear the Gospels only became widely known in mid 2nd C. or so, before that, no-one seems to have heard of them.
Kapyong