 Soon after, however, Baghdad philosophy was dominated by self-styled Peripatetics who presented themselves as reestablishing Aristotle's true teachings after a period of rupture. The leading lights of this movement were the Syriac Christian Abû Bishr Mattâ ibn Yûnus (d. 940) and his younger Muslim colleague, Abû Nasr Alfarabi (d. 950). In the early 900s, Abû Bishr added translations from the Syriac of the Poetics and the Posterior Analytics to the growing Arabic Organon. He and his colleagues also contributed to a commentary tradition on each component of the Organon.