They were the three brothers born to Cronus who is Saturn.
Jupiter=zeus went on to be the god of gods, defeating Saturn(whatever that meant) and the other two were more or less “sentenced” or “awarded” to their respective positions. So they can have a tendency to be competitive as a result of getting the short end of the stick in life. When they feel they re not successful or getting what others are, they become salty jealous malice-carrying petty signs. These are their lower vibrations though, they can choose to focus on the role they’ve been handed and perform their duties with honor instead of martyrdom. Scorpio is better at this. Pisces typically uses sex as an outlet for this frustration. Both are highly fixates on financial success and stability. Needless to say they both wished they had been given the role Sagittarius was given. This mythological story can also lead Sagittarius to have boisterous confidence, especially those who embrace a societally masculine personality. They can be arrogant and push their agenda on others, acting as a leader when nobody elected them to be.