Q Source: Bio of Julius Caesar Part IV – Bkgrnd v Gospels as Ancient Roman Propaganda
The gospels are not that hard to manufacture given the literary talent of Ancient Rome (and who the propagandists were/might have been).

The Georgics

Sometime after the publication of the Eclogues (probably before 37 BC), Virgil became part of the circle of Maecenas, Octavian’s capable agent d’affaires who sought to counter sympathy for Antony among the leading families by rallying Roman literary figures to Octavian’s side. Virgil came to know many of the other leading literary figures of the time, including Horace, in whose poetry he is often mentioned,and Varius Rufus, who later helped finish the Aeneid.

At Maecenas’ insistence (according to the tradition) Virgil spent the ensuing years (perhaps 37–29 BC) on the long didactic hexameter poem called the Georgics (from Greek, “On Working the Earth”) which he dedicated to Maecenas.

Virgil and Maecenas are said to have taken turns reading the Georgics to Octavian upon his return from defeating Antony and Cleopatra at the Battle of Actium in 31 BC.

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Now, how do we get from here—the subject of the Georgics is supposed to be working the earth, running a farm—to Julius Caesar, skeleton of Jesus and the historical figure giving substance to a lesser historical figure? The answer is in the following quote from the Georgics:

… the sun, too pitied Rome when Caesar died [it] hid its shiny face in dim dusky red and that impious generation feared eternal night. … lightning flashed from heaven on high like never before and terrifying comets blazed down upon the unholy.

The sun too, both at rising, and when soon
He dives beneath the waves, shall yield thee signs…
Upon the sun’s own face strange colours stray;
Dark tells of rain, of east winds fiery-red;
If spots with ruddy fire begin to mix,
Then all the heavens convulsed in wrath thou’lt see—
Storm-clouds and wind together. Me that night
Let no man bid fare forth upon the deep,
Nor rend the rope from shore. …
Who dare charge the sun with leasing? He it is who warns often
of hidden broils at hand, treachery
and secret swelling of the waves of war.
Also, when Gaius Julius Caesar was killed.
The Sun veiled his bright head in iron-hued darkness
And the godless age trembled that there would be night eternal.
With the Sun, Earth, ocean-plains, dogs obscene, and evil birds
bode tokens.
How often have we seen the Cyclops of a volcanic mountain, Mt. Etna,
her furnace-walls asunder riven in billowy floods boil over, rolling down
globes of fire and molten rocks?
A clash of arms through all the heaven-sky (lightning) was heard.
By Germany, strange heavings shook the Alps.
By many, even in breathless groves, a voice with Power was heard
and wondrous-pale, Phantoms were seen
upon the dusks of night.
From cloudless skies fell thunderbolts
And often blazed comet fire.
Book 1, 424 – 466ff
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     The sun will be darkened
and the moon will not give its light.
     The stars will fall from the sky and the powers of the heavens
will be shaken.
     Then they will see the Son of Man coming in the clouds with great power
and glory.
     And he will send out the angels to gather His elect from the four winds,
from the ends of the earth to the ends of heaven.
Mark 13: 24-27