Calbaron III was a planet.
The Twelfth Doctor reserved a table for himself and Clara three years into the future. They were able to arrive instantly in the TARDIS only to find it closed for the third anniversary of the overthrowing of their emperor. Annoyed the Doctor travelled back to 5083 and was informed he would have to reserve a table in 5080 for a spot today. As the Doctor prepared to do so, he saw that his TARDIS had been scratched. Informed by a passerby that Emperor Vimlox had done so, the Doctor overthrew him in retaliation. (COMIC: Planet of the Diners)