History was a method of perceiving and recording time.
The Great Houses' anchoring of the thread created the structure of history and many of the Laws of Time, like the Protocols of the Great Houses. In essence, it made the Spiral Politic. The Homeworld was beyond the effects of history until just before the War. When House Paradox embraced the idea of "changing" history, it was a shock to the other Houses.
For the Homeworld, the anchoring marked the beginning of history and the frontier in time its end. However, many posthuman cultures existed beyond that point, making them inaccessible to the Houses.
Non-linear cultures perceived time differently, but none of them were ever able to time travel, so were considered unimportant by the Houses. (PROSE: The Book of the War)
The Osirian Court cut itself off from history. (AUDIO: Words from Nine Divinities)