Ptolemy I was an ancient Greek king and founder of the Ptolemaic dynasty in Egypt. In literature, the name Ptolemy I is commonly associated with terms such as "Ptolemy Soter," which means "savior" in Greek, or "Ptolemy the Benefactor." Other synonyms for Ptolemy I include "Ptolemy the First," "Ptolemy Lagus," and "Ptolemy Philadelphus." The latter referred to his close relationship with his sister-wife, Arsinoe II. Ptolemy I's reign was marked by his successful efforts to expand the territory of Egypt and to establish a prosperous and culturally rich dynasty that lasted for over three centuries.