Chronology

An approximate chronology for some significant events

The Satan episode.
Shortly after, the Tamethan uprising.
Shortly after that, David Falkayn begins the search that leads him to Mirkheim.
Ten years later, Nicholas van Rijn repeats that search.
Seven years later, Leonardo Rigassi finds Mirkheim.
One year later, the Baburites seize Mirkheim.

Sources

Satan's World describes the Satan episode.
"Lodestar" describes the Tamethan uprising and van Rijn's search.
Mirkheim notes Falkayn's search and Rigassi's discovery and describes the Babur War for Mirkheim and Hermes.

Chronologically slightly confusing. Sandra Miesel's Chronology of Technic Civilization allows only ten years between "Lodestar" and Mirkheim but see also here.