In May this year, the English press revealed that the niece of King Charles III would be living in Portugal, following a luxury real estate venture by her husband between Comporta and Melides.
I wonder how long their visa processing took?
https://www.theportugalnews.com/news/2023-11-22/living-in-portugal-is-a-dream/83498
They probably have diplomatic passports anyway 
The other members of the Royal family have ordinary passports unless they are Working Royals, in which case they would be issued with diplomatic passports. Moving to PT with a D7 is a peice of cake as it needs minimal documentation and short waiting times. We were all lured by the law firms and other agencies for a GV trap, unless you don’t live within the Portuguese territory for 183+ Days an year GV is kinda useless…