Olleril was a planet that orbited two small suns. It was on the far rim of the Pristatrek Galaxy, near Pangloss.
The natives celebrated Tragedy Day, a day of generosity for the less fortunate. The largest city on the planet was Empire City. (PROSE: Tragedy Day)
Bernice Summerfield searched for the Doctor's remains on the planet, but found nothing. (PROSE: The Shape of the Hole)