In 332 BC, Alexander III of Macedon conquered Egypt with little resistance from the Persians and was welcomed by the Egyptians as a deliverer. The Macedonian government established by Alexander's successors, the Ptolemies, was based on an Egyptian model and based in the new capital city of Alexandria. The city was to showcase the power and prestige of Macedonian rule, and became a seat of learning and culture, centered at the famous Library of Alexandria. [58] The Lighthouse of Alexandria lit the way for the many ships, which kept trade flowing through the city, as the Ptolemies made commerce and revenue-generating enterprises, such as papyrus manufacturing, their top priority. Macedonian culture did not supplant native Egyptian culture, as the Ptolemies supported time-honored traditions in an effort to secure the loyalty of the populace. They built new temples in Egyptian style, supported traditional cults, and portrayed themselves as pharaohs. Some traditions merged, as Macedonian and Egyptian gods were syncretized into composite deities, such as Serapis, and classical Macedonian forms of sculpture influenced traditional Egyptian motifs. Despite their efforts to appease the Egyptians, the Ptolemies were challenged by native rebellion, bitter family rivalries, and the powerful mob of Alexandria which had formed following the death of Ptolemy IV. Egypt became a province of the Roman Empire in 30 BC, following the defeat of Marc Antony and Ptolemaic Queen Cleopatra VII by Octavian (later Emperor Augustus) in the Battle of Actium.