Who is Mr. A?

The following is an original riddle from the Puzzle Crafter, himself.  Can you figure out the true identity of Mr. A?

Three trinkets in my pocket,
each, in their own way,
carry with, a secret
-the name of Mr. A.

The first, Athena’s daughter,
pale green, crisp, rump-round,
sings of a life, long-lived,
and happy partridge sound…

“I had a little nut tree,
Nothing would it bear
But a silver nutmeg
And a golden - -;
The King of Spain’s daughter
Came to visit me,
And all for the sake
Of my little nut tree.”

The second, lucky brothers, 
I’d take a chance to say,
are inclined, with their blocked mind,
to roll my fate away.

Solid friends of Plato,
from ancient days they hail,
with score and one
black eyes staring
sunk in faces pale.

And finally, the best of all,
a cut above the rest,
is a weapon and a tool,
uses: snipped and blessed.

Don’t let these trinkets fool you,
genteel though they may claim,
they have a bond that when revealed,
give Mr. A’s first name.

And with that knowledge,
one might deduce
the brothers’ lauded crime.
To call them plainly,
those words produced,
with Mr. A’s surname, rhyme.

When it all comes to an end,
I’d wager that you’ll pray,
to find yourself, 
at the gates of heavenly Mr. A.