We would have to go back to King Charles I in 1647 to find the last time such a senior member of the royal family was arrested and that didn't rnd well for him as he was executed two years later for treason.
I imagine the knock on the door at 8am this morning at the Sandringham Estate in Norfolk was a lot less hostile than that conducted by the New Model Army back then but here we are with Andrew Mountbatten-Windsor, the former Prince Andrew, arrested on suspicion of misconduct in public office which is 'a serious wilful abuse or neglect of powers relating to the role in public office', according to the Crown Prosecution Service (CPS) and carries a maximum sentence of life imprisonment.
The force previously said it was reviewing allegations that a woman was trafficked to the UK by sex offender Jeffrey Epstein to have a sexual encounter with Andrew as well as claims he shared sensitive information with the US sex offender while serving as the UK's trade envoy between 2001 and 2011.
A former Police Chief said that this is massive because you don't have to arrest somebody that they are investigating, they can ask them to provide a statement or even invite them to a police station for a formal chat without arresting them so to actually arrest him, would suggest there is some significant and strong evidence.
Famously lying at every turn in his interview with Emily Maitlis with regards to Virginia Giuffre who took her own life, he will not know be able to flip off questions quite so easily and they will drill down on the allegations that she had had sex with him when she was 17 and claimed she had been trafficked by Jeffrey Epstein.
A statement from her family reads: At last. Today, our broken hearts have been lifted at the news that no one is above the law, not even royalty. We extend our gratitude to the UK's Thames Valley Police for their investigation and arrest of Andrew Mountbatten-Windsor'.
What effect this had on the future of the Royals is unknown but as it has been revealed that the King paid £3m of the reported £12 that Andrew gave to Giuffre in an out of court settlement to keep her from spilling the sordid beans on him, so he isn't is coming out of this clean.
Despite famously saying that he has a condition that means he doesn't sweat, i imagine the former Duke is sweating profusely today.