Belus in Latin or Belos in accurate Greek transliteration is one of:
Persons
Ba‘al: a title ("lord") in northwest Semitic languages, often applied to particular gods.
Bel: a title ("lord") in Akkadian, especially applied to the Babylonian god Marduk but also used of other gods.
Belus (Babylonian): the Greek Zeus Belos and Latin Jupiter Belus as translations of the Babylonian god Bel Marduk or an euhemerized version of that god.
Belus II. See Dido. In Virgil's Aeneid (and some later works) he is king of Tyre and father of Dido, Pygmalion of Tyre, and Anna. As such this Belus is to be equated with the historical King Matan I of Tyre.
Belus (Lydian). See Omphale. He was a grandson of Heracles and ancestor of the Heraclid dynasty in Lydia according to Herodotus.
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Belus is also at the court, having revealed his true identity to the King - he was a royal scribe and astrologer of the Royal Household of Babylon, and priest of Marduk and of Ischtar, as well as being a son of Nebuchadnazzar and so a close a relative of the King.
Belus stays with various influential priests, astrologers and others, and ferments opposition to King Belschazzar, which isn't difficult since he is widely seen as a tyrant - and his war with Cyrus of Persia is going badly.
As usual the character of Belus acts at once as advisor and counsellor to Ramose, and as the conduit much of the story to the reader - and as is often the case there is much of Haggard himself in the character.