I would like to establish the historicity of this person.
Julia does not sound like a name that would be in use in Brythonic speaking pre-Roman Conquest Britannia.
Several web-sites cite her as the daughter of Prasutagus and Boudicca
https://www.wikitree.com/wiki/Iceni-4
https://fabpedigree.com/s037/f000269.htm
https://gw.geneanet.org/rlobri?lang=en&n=des+iceniens&p=jul...
https://ancestors.familysearch.org/en/L636-MCH/penardun-julia-victo...
https://www.genealogieonline.nl/en/stamboom-ratsma/I1411.php
There are others.
I am sceptical.
Are these genuine?
Thanking you in anticipation.