Walenkov

From Gineipaedia, the Legend of Galactic Heroes wiki

Walenkov (Japanese: ワレンコフ) was a Fezzani political leader who served as the fourth Landesherr (Land Lord) of the Dominion of Fezzan. Not much is known about him beyond the fact that Adrian Rubinsky served as his senior secretary and succeeded him as Landesherr. He was assassinated by the Terraist Church—the true masters of Fezzan—for trying to act too independently of them. (Encyclopaedia Die Legende der Sternhelden)

The Grand Bishop would bring up Walenkov's example as a warning to Rubinsky in 796 UC (487 IC / 3596 CE) to not betray the Church. (LOGH: 'New Trends')