In what year did Alexander the Great conquer Egypt?

Alexander the Great conquered Egypt in 332 B.C.

The conquest took place during Alexander's war against the Achaemenid Persian Empire. Egypt had recently been brought back under Persian control, but when Alexander arrived in 332 B.C., Persian resistance was limited and many Egyptians viewed him as a liberator. Control of the country therefore changed hands with relatively little fighting compared with Alexander's siege of Tyre or his later campaigns in Central Asia.

Alexander visited Memphis, where he was crowned in the Egyptian tradition, and he showed respect for local religious customs. He also traveled to the Siwa Oasis, where the oracle of Amun identified him with the god. During his brief stay, he founded Alexandria on the Mediterranean coast, a city that later became the capital of the Ptolemaic Kingdom and a major center of scholarship.

Alexander left Egypt in early 331 B.C. to continue pursuing the Persians. After his death in 323 B.C., his general Ptolemy took control of Egypt and established the Ptolemaic dynasty, which ruled until Rome annexed the kingdom in 30 B.C.