It is a frequent feature of common hacks to start by quoting something like "already the ancient Romans well understood ..." followed by whatever nonsense they feel compelled to propagate.
Now in fly fishing, as usual, a different apprach is required. First of all, an ancient Roman actually did describe the origins of our sport - as all who read Claudius Ælianuses opus magnus Περὶ Ζῴων Ἰδιότητος in the original Greek well know. The second reason is that the ancient Romans well understood the importance of the colour Purple well before the time of colonel Oliver Kite.
#16 Dohiku dry fly hook
14/0 Sheer thread, grey
Coq de León tails
Heron herl body
Danville's 6/0 purple thread head