The World's Desire by H. Rider Haggard

Rei the Priest saw and heard. Then turning, he stole away through the maddened throng of women and fled with what speed he might from the Temple. His heart was filled with fear and shame, for he knew full well that Pharaoh was dead, not at the hand of Hathor, but at the hand of Meriamun the Queen, whom he had loved. He knew well that dead Meneptah spake not with the voice of the dread Gods, but with the voice of the magic of Meriamun, who, of all women that have been since the days of Taia, was the most skilled in evil magic, the lore of the Snake. He knew also that Meriamun would slay Helen for the same cause wherefore she had slain Pharaoh, that she might win the Wanderer to her arms. While Helen lived he was not to be won away.

Now Rei was a righteous man, loving the Gods and good, and hating evil, and his heart burned because of the wickedness of the woman that once he cherished. This he swore that he would do, if time were left to him. He would warn the Helen so that she might fly the fire if so she willed, ay, and would tell her all the wickedness of Meriamun her foe.