Unicorn Royal Family
From Equestripedia, the Archives of Equestria!
The Unicorn Royal Family was an ancient royal family active during the Founding of Equestria as apart of the Unicorn Kingdom. The family's only known members were Princess Platinum and King Bullion, with the only known settlement being Unicornia. The fate of the family is unclear, but it's likely they lost any power after Equestria was founded.