Praestilyn was not colonized about 100 years before the Battle of Endor. It's not that it wasn't suitable for colonies, it's just that nobody got around to it. Finally some lumberjacks from Onderon set up a small logging community and declared themselves to be a sovereign planet. Just before the Clone Wars began, Praesitlyn joined the Confederacy of Independent Systems. Anakin Skywalker and Nejaa Halcyon took the planet back for the Republic.
We'll let you know if we think of any.