Aristocrat Leto Atrerodis is the ruler of Ocean Planet or Calledon. Leto also serves as Emperor Saddam IV. Saddam is the ruler of this entire universe. Saddam suddenly makes Leto the ruler of a world called Araki. Araki is a desert planet, but it’s the most valuable thing in the universe. That’s what spice is all about. These supplies can be used to extend human life, to travel to space, and to the most essential things. Just like the crude oil in the desert Arab countries.
So Shadam realizes that if he has a threat in the future, it will come from Leto. Because Leto is a ruler who cares about people. Is that why Emperor Shadam handed over the most valuable planet, Araki, to the Athardis dynasty? Then what is it? Why hand over the most valuable planet in the universe to an enemy you face? When is a gift not really a gift? At that time, the Harkonon clan was at war with the Atroides clan.