The Road and the Hills by Alison Spedding. The first book in the Walk in the Dark series.

Set approximately in the time of Alexander the Great.

Ailixond, Lord of Safi, had taken his all-conquering army across half the known world, intent upon building an unrivalled empire and fame that would endure for all time. When an ambiguous young vagabond enlisted on the road to Haramin, no one thought that her arrival would have dramatic effects upon the twin destinies of Ailixond and his empire.

This paperback book of 327 pages is published by Harper Collins/Voyager in 1997. 

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