What is "olympiodorus"

There are several late-Roman figures named' Olympiodorus':

• Olympiodorus the Seleucid (c. 178 BC), 2nd-century BC high-priest in Coele-Syria and Phoinike, commissioned by Seleucus IV Philopator
• Olympiodorus of Thebes (fl. 412), 5th-century historical writer
• Olympiodorus the Younger (c. 495 – 570), 6th-century Neoplatonist philosopher, last pagan head of Alexandrian School, and astrologer
• Olympiodorus the Elder, 5th-century Peripatetic philosopher and teacher of Proclus