Epocha

[S]tanding publick Records have been kept of theſe vvell atteſted Relations, and Epocha’s made of thoſe unvvonted events.

Source: wiktionary

This Destruction of the Tea is so bold, so daring, so firm, intrepid and inflexible, and it must have so important Consequences, and so lasting, that I cant but consider it as an Epocha in History.

Source: wiktionary

[T]hese dancers were the very men whose bravery formed the great epocha of French liberty; the heroes who demolished the towers of the Bastille, and whose fame will descend to the latest posterity.

Source: wiktionary