Rubinsky's mansion
From Gineipaedia, the Legend of Galactic Heroes wiki
Adrian Rubinsky's mansion was a residence in the Okanagan Mountains of Fezzan, which served as a hideout for Rubinsky and about fifty others, including Dominique Saint-Pierré, following his removal from power in 798 UC (489 IC / 3598 CE). (LOGH: 'The Long Road Ahead')
It was abandoned by Rubinsky's party by late December of 800 UC (2 NIC / 491 IC / 3600 CE). (LOGH: 'Endless Requiem')