HISTORICAL NOTE: Tiberius (AD 14 - 37): Tiberius was the second Roman Emperor and a member of the Julio-Claudian dynasty. He was one of Rome's greatest generals, but he is remembered as a dark, reclusive, and somber ruler. During his reign, Tiberius left most of the day-to-day administration of the empire to his unscrupulous Praetorian Prefects Lucius Aelius Sejanus. Tiberius continued the monetary policies of Augustus, maintaining the weight and purity of the Aureus and Denarius. He also issued a series of bronze coins, including the As, Dupondius, and Semis. His conservative fiscal policies helped to stabilize the Roman economy during his reign. As: The As was a fundamental unit of the Roman coinage system, first produced in the late 4th century BCE. It was initially a large bronze coin, but its weight and composition changed over time. By the 1st century AD, the As was primarily made of copper and had significantly reduced in size. Despite these changes, the As remained in regular use for more than 500 years, serving as a standard unit of currency throughout the Roman Republic and the early Roman Empire.