No one is quite sure how Darth Sidious came across his young and deadly apprentice. He was raised from an early age to be a weapon, tempered by harsh, abusive training to become an incredible warrior. Once a Zabrak from Iridonia, Maul abandoned all trace of his former identity when he took on his Sith name. So complete was his devotion that he even endured the agony of having intricate Sith tattoos applied to his entire body. In the interests of concealing the Sith presence from the Jedi, all of Maul's missions were executed from the shadows. Though Maul longed to reveal the Sith menace to the Jedi, his devotion to his master was absolute so as not to question Sidious' timing. Maul had assassinated a number of enemies whose activities encroached on the growing Sith agenda. The dark warrior even infiltrated the heart of the galaxy's biggest criminal organization, Black Sun, killed, and escaped unscathed. Maul had a wide array of tools to help him in his missions. His Sith Infiltrator is a modified star courier vessel equipped with a cloaking device. His Sith speeder is lean and unarmed, pared down to the bare essentials to deliver maximum speed. In the past, he has even employed a modified protocol droid as an assassin, C-3PX. I think Darth Plagueis Forsaw his death and maybe planned on killing Palpatine but Palpatine beat him to the punch and killed Plagueis, Maybe Palpatine saw Plagueis use the force to create life in Shmi Skywalker and decided to take action....but i do believe either Sidious or Plagueis created Life who became Anakin Skywalker, lets not forget though Dooku trained GG in the ways of the Force and trained Asajj Ventress as well so i think there might have been exceptions to the rule, also maybe Palpatine needed a full grown Sith for reasons such as killing Jedi and doing these secret missions, Maybe Palpatine would have killed Maul or at least set him up to die much like he did for Dooku..... "We will watch your career with great interest"