If Brutus is the subject of loyalty, you may wish to look at how Marc Antony eulogizes Brutus in the final act after Brutus is slain and the triumvirate prevails in the battle at Philippi. Most importantly, Antony praises Brutus as "the noblest of them all":
This was the noblest Roman of them all.
All the conspirators, save only he,
Did that they did in envy of great Caesar;
He only, in a general honest thought
And common good to all, made one of them.
His life was gentle, and the elements
So mix'd in him that Nature might stand up
And say to all the world, “This was a man!” (5.5.74-81)
Again, a conclusion summarizes what has been proven in the body of the essay. So, if you have written about Brutus and his integrity and high principles, this passage may prove useful to you.
What I think you are asking is how to write an essay conclusion when your essay defines loyalty in relation toJulius Caesar. You're partly right in thinking a conclusion is comprised of a summary of your essay, though it is more accurate to say a conclusion reviews the points you've proven. If your body prove Caesar's loyalty or disloyalty to country, family, friends, restate in a sentence how you proved each: hypothetical example: Since textual evidence proves Caesar's loyalty to his country by rejecting the crown three times, then the definition of loyalty to country is also proven. Of course, this is purely hypothetical since I've no idea of your actual essay.
Brutus is perhaps the most interesting study in loyalty, as he indeed places loyalty to the Republic over personal loyalty to his friend Caesar. Antony, I think, is in many ways as loyal to Antony as he is to his dead friend. If I were to write about loyalty, it would be about Brutus. Is he a traitor to his friend or a martyr for his country?
I'd agree with post 3 here and suggest linking one character to each aspect of your definition of loyalty. Antony presents loyalty to his friends. Brutus can be said to be loyal to his country.
If you are discussing loyalty in context to the playJulius Caesar, it would be an interesting conclusion to take the main points and apply them to characters in the play. Which ones exhibit loyalty based on your definition's points, or are any one of your main points more important than the other?
I describe loyalty be devotion towards your country, your family, and your friends.