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It depends on how the question is read. If the question is asking who was the man who created first empire through conquest, it would Sargon of Akkad, who created the Akkadian Empire - the world's first empire. If the question is asking who was the man who conquered the world's first empire (for some other empire), the question is unanswerable. The Akkadian Empire was never conquered. It fell apart for various reasons before any state existed that would be powerful enough to challenge it.
Who was the leader of the Spanish army that conquered the Inca Empire? Francisco Pizarro in 1535 Who conquered the Aztec empire? Herman Cortes conquered the Aztecs in 1519.
Sargon
Abu Bakr carried out the first conquests Rashidun Caliphate which was then expanded by his successor. He did not actually conquer any empires. He conquered mesopotamia (iraq) from the Persian (Sasanian) Empire, but not persia itself. He conquered Syria from the Byzantine Empire, but not the rest of this empire.
Assyria conquered Israel, then Babylon conquered Assyria and Judah, then Persia conquered Babylon, then the Seuclid Empire conquered Judah, then the Judeans revolted, then Rome conquered Judah, then the Islamic Caliphate conquered the Byzantine Empire (the remains of the Roman Empire). The Ottoman Empire conquered Judah from the Cusaders who had conquered it from its Islamic rulers. Then the British Empire took it from the Ottomans.
The Medes.
The Mongol Empire - Mongolia Conquered Asia,Eastern Europe, and the Middle East
Aztec empire
The First Crusades traveled east and conquered 3/5 cities in Eurasia. Two cities in Europe were not conquered, and three cities in the Asia Minor were conquered. They traveled through the Holy Roman Empire and Byzantine Empire.
Alexander conquered the Persian Empire.
Alexander the Great of Macedon
Alexandria was the city he first founded. By ariscari