How long was the rule of the dynasty that was active when the Rosetta Stone was inscribed?
Ptolemaic dynasty The Ptolemaic dynasty (Ancient Greek: Πτολεμαῖοι , "Ptolemaioi"), sometimes also known as the Lagids or Lagidae (Ancient Greek: Λαγίδαι , "Lagidai", after Lagus, Ptolemy I's father), was a Macedonian Greek royal family, which ruled the Ptolemaic Kingdom in Egypt during the Hellenistic period. Their rule lasted for 275 years, from 305 to 30 BC. They were the last dynasty of ancient Egypt.
Ptolemy V Epiphanes Ptolemy V Epiphanes (, "Ptolemaĩos Epiphanḗs" ≈ Ptolemy the Illustrious); reigned 204–181 BC), son of Ptolemy IV Philopator and Arsinoe III of Egypt, was the fifth ruler of the Ptolemaic dynasty. He inherited the throne at the age of five, and under a series of regents, the kingdom was paralyzed. The Rosetta Stone was produced during his reign as an adult.