Sir Henry Curtis (Zulu name: Incubu, which means "Elephant") was the constant companion and fellow traveler of Allan Quatermain.
Sir Henry first became acquainted with Quartermain when he left from England to Natal province, South Africa to request help in search of his brother, George Curtis. Although unwilling at first, Quartermain is eventually persuaded to help lead him along with Commander John Good of the Royal Navy to the Heart of Kukuanaland, where George is expected to have disappeared looking for King Solomon's Mines.
Sir Henry is especially noted for his enormous size and stature, his muscular physique, and his long, blonde, locks, no doubt inherited from his Danish forebears.
Sir Henry is, especially in Kukuanaland, noted for his bravery in battle, such as when he lead the Greys, the elite regiment in the Kukuana army, against the evil king Twala in an unevenly matched battle, with Twala having the advantage, or even when he slays the king himself in hand-to-hand combat. He is so highly decorated, that any feat of strength afterward in Kukuanaland is known as Incubu's Blow.