Here is a list of The Godspeaker Trilogy Books in Order.
#1 – Empress (2007)
From the blurb:
When a scrawny, unwanted child – so lowly that she does not even have a name – is sold into slavery, a chain of events is set in motion that will have a profound impact on all the civilised world.
Naming herself ‘Hekat’ (after a slaver’s observation that she is quite the hellcat), the girl is taken in chains to Mijak’s largest city, but makes a bargain with a ruthless god and escapes her captors. After she saves the life of a warlord, he takes her in and teaches her ways that an orphan might use to prosper in an uncaring world.
When the warlord’s family dies, the way becomes clear for Hekat to carve a dynasty out of infidelity and betrayal. . .