TPM Mace Windu
So originally it was believed that Vaapad was developed in the time between TPM and ROTS. However in The Jedi Path: A Manual for Students of the Force, it says that Qui-Gon refused to allow Obi-Wan to study it. Similarly Cin Drallig would not let Anakin study it. This suggest to me that it was an established, perhaps completed form even as of TPM.
That's an extra feat for Qui-Gon Jiin who was said to be on par with Mace in his prime.