GT Humaniti has some bits, including the bad news that only three of their "core" worlds survived the Long Night: Shiwonee, Lagna, and Hiponee. Dreva was recolonized following a nasty war on Hiponee sometime after -150. The Duchy of Shiwonee was established by Arbellatra in 625, and the present section indicates that the Duchy has ten worlds, including Tsalov and Llyrn.
It does also mention that other colonies survived elsewhere in the Imperium, coming out of the woodwork after the formation of the Duchy.
That's a bit of a problem. Llyrn is a minor homeworld of someone else... and the Duchy of Shiwonee would have been created by the subsector Duchy system sometime before. Now Arbellatra might have appointed a Geonee Duke instead in 625 (and that's very likely); but there's some other bits I'm aware of that aren't public yet.