Time's Tapestry - AbsoluteAstronomy.com

Time's Tapestry is a four-volume alternate history and science fiction

Science fiction

Science fiction is a genre of fiction dealing with imaginary but more or less plausible content such as future settings, futuristic science and technology, space travel, aliens, and paranormal abilities...

series by British author Stephen Baxter

Stephen Baxter

Stephen Baxter is a prolific British hard science fiction author. He has degrees in mathematics and engineering.- Writing style :...

. The four novels are Emperor
Emperor (Stephen Baxter)
Book one of four in Stephen Baxter's alternate history and science fiction series Time's Tapestry.-Synopsis:A mysterious prophecy from the future shapes the destiny of a family through four centuries of the Roman occupation of Britain. Begins in 4 BC and incorporates such later events as the...

, Conqueror
Conqueror (Stephen Baxter)
Book two of four in Stephen Baxter's alternate history and science fiction series Time's Tapestry.- See also :*Emperor *Navigator *Weaver...

, Navigator
Navigator (Stephen Baxter)
Book three of four in Stephen Baxter's alternate history and science fiction series Time's Tapestry.- See also :*Emperor *Conqueror *Weaver...

, and Weaver
Weaver (Stephen Baxter)
Weaver is an alternate history and science fiction work authored by Stephen Baxter. It is the fourth and final novel in his Time's Tapestry quartet, which deals with psionic broadcast of history-altering content within trans-temporal lucid dreams....

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The narrative begins in 4 BC and ends in 1943 (in a different timeline than our own).

In short, the science-fiction premise of this alternate-history epic is that our timeline today, i.e., history as we know it, is the result of a series of interventions from an alternate future into its past, the last of which occurs as the story ends, resulting in our own timeline.