Question: How long was the rule of the dynasty that was active when the Rosetta Stone was inscribed?
Sentence (from "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.
Relevant evidence: Yes