Muark Tan was a Glath starship captain who lived thousands of years ago, described as a wanderer.
While visiting Rigel VIII, Muark Tan collected samples and data about the sentient humanoids discovered living there. This included photographs, tools, weapons, clothing and three live specimens—Orions. They were already valuable as slaves on the open market and thoroughly interfered with by aliens.
Next, on the 15th July 17,273 BCE (reference stardate −192/7307.15), Muark Tan visited Rigel VI and showed the Rigellians the evidence. (FASA RPG module: The Orions: Book of Deep Knowledge)