Éowyn is a fictional character in J. R. R. Tolkien's The Lord of the Rings. She is a noblewoman of Rohan who calls herself a shieldmaiden.
Éowyn
Catherine of Aragon
for Catherine of Aragon in Six: The Musical- Multifandom Version
Suggested by caitlinfrost
Again, no real people and no gender-bending the characters. If fictional characters put on a production of Six, who would play the queens?