Why did Justinian I fail to regain all of the former provinces of the old Roman Empire? His general made military blunders.
His troops mutinied.
His army and finances were weakened by plague.
He didn't equip his troops well.

His army and finances were weakened by plague.

Explanation:

Justinian I was the emperor of Byzantine from 527 to 565. He was noted for his administrative reorganization regarding the imperial government as well codification of laws.

Justinian I fail to regain all of the former provinces of the old Roman Empire army and finances were weakened by plague.

His army and finances were weakened by plague

Explanation:

“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.