Factual error: The poem Isolde recites, John Donne's "The Good-Morrow", is a 17th-century work, which is centuries later than the movie's time period.
Factual error: In the scene where Tristan is making his return from Ireland and the crowd is gathering around him there are two hens in the foreground. One is a Rhode Island Red and the other is a Black Plymouth Rock. Both of these are American breeds of chicken and did not appear until many hundreds of years after this film is set.
Answer: For Dark Age beauty hints look at the website of historical novelist Octavia Randolph, on https://octavia.net/ Your question is brilliantly answered in the section https://octavia.net/early-cosmetics/ The Pre-Christian Anglo-Saxons and Vikings were buried with grave goods, items they used in everyday life. Archaeologists often uncover burials of men and women who were buried with elaborately carved combs for hair care, tweezers for plucking out surplus hair, ear scoops and small wash basins. There is good evidence that people processed herbs and flowers as cosmetics and make-up.
Rob Halliday