Ptolemy I Soter was a prominent general and companion of Alexander the Great. After Alexander's death in 323 BCE, Ptolemy became the ruler of Egypt and established the Ptolemaic Kingdom. He is known for founding the famous Library of Alexandria, which became a center of learning and culture in the ancient world. Ptolemy I was not only a skilled military leader but also a savvy politician. He promoted the blending of Greek and Egyptian cultures, which helped to stabilize his rule. His reign marked the beginning of a dynasty that lasted nearly 300 years, influencing the Mediterranean region significantly.