Answer:
Julius Caesar was a smart, brave, ambitious, and megalomaniac. He had many positive qualities that made him a succesful, powerful, and popular man, but also some flaws that ultimately contributed to his downfall.
Explanation:
He was smart because his military intelligence allowed him to defeat many enemies, including those in Gauls. He was ambitious because he concentrated lots of power in himself. He was megalomaniac because he wanted to end the Republic and become dictator for life.
This last aspect is what brought his downfall. He gained the repulsion of most of the Senate, who deemed him to be an existential threat to the Roman Republic, and a public danger, so much that they plotted to kill him, and succeeded in doing so.
