Lawal was stripped of her title in March and Chief Ameringun installed as the Iyaloja.
She filed the suit at an Oyo State High Court.
In the suit by her counsel, Akinjide Sadiq and others, Lawal is seeking a declaration that appointment and installation of the third defendant as Iyaloja of Ibadan land by the first and second defendants on March 20 is illegal.
She said the appointment and installation was not only wrong, but also violates her rights to natural justice.
Chief Lawal prayed the court to declare her opponent’s appointment null and void and of no legal effect.