Timeline

Dated events in the history of Mainframe, in the order the records give them. Years are counted in AI, the calendar the sources use. Events without a recorded date, such as the Derailment itself, are left out.

Year	Event
2nd century AI	Clement, an electrician, teaches that the Citadel's electrical patterns reveal a divine Curriculum. After his death his followers form the first Clementine community.
3rd century AI	Acheron missionaries find a functioning terminal near the center of Zion. The settlement becomes Ganden.
530 AI	Tzhal and Ges found THALIT.
6th century AI	A Ganden law bars teks from settling inside the city's final signal-light. Displaced families build the camp that becomes Tabor.
9th century AI	Breachers in remote Mainframe make the first credible contacts with aberrations.
890 AI	The captain known as Orphan describes the Cachalot.
966 AI	The Old War begins when the expanding THALIT Union invades the central city-states.
1022 AI	Philippus of Heraclea descends the Stairwell Shaft beneath Black Bridge Cape. His expedition documents five aberration species and recovers a sample of iron moss.
1510 AI	The Credit Revolution. THALIT falls; Ganden takes the richest routes and surviving commanders form the TZHAL Emergency Government.

Source: the World archive on thecitadel.com.