Factor L!
CarausiusBook 2, l.122-123: the 1st written mention of sunscreen when Phoebus applies it to Phaethon’s face? “tum pater ora sui sacro medicamine nati contigit et rapidae fecit patientia flammae” Then the father covered his son’s face with sacred ointment, allowing it to endure the swift fire [of the sun]