Pebble in the Sky became the basis for the Empire series.

In order of internal chronology the Empire series consists of:

Hollywood is the fifth historical novel in Gore Vidal's Narratives of Empire series.

Gore Vidal's 1876 is the third historical novel in his Narratives of Empire series.

Burr is the first sequential novel of the author's seven-novel Narratives of Empire series.

It also maintains the strategy aspect of the Empire series, and is not just another space shooter sim.

This work is generally regarded as part of the Empire series, but does not directly mention either Trantor or the Spacer worlds.

They don't make the Empire series any more.

Rigel, the name of the star, is assumed by one of its planets in the Empire series.

It features interlinked stories set in the universe of her Hidden Empire series.