Wilbur Smith.

"River God"
Pan Books
Published in 1994, first Pan Books edition.
First published in 1993 by Macmillan.
Contains 662 pages of the novel River God by Wilbur Smith.
"At the festival of Osiris, loyal subjects of the Pharaoh gather to pay homage to their leader. Only Taita - a wise and formidably gifted eunuch slave - sees him as a symbol of a kingdom's fading glory.
Danger surrounds all those who oppose the ruling élite. But together with his protégés, Lostris, beautiful fourteen-year-old daughter of his master Lord Intef, and the proud young army officer Tanus, Taita begins the long and dangerous journey towards his own glorious dream - to restore the majesty of the Pharaoh of Pharaohs on the glittering banks of the Nile."