Abstract: The Democratic Union Party (PYD) has emerged as one of the biggest beneficiaries in the Syrian war, triggered by the Arab Spring. Since its inception in 2003 until 2011, the party had not found the chance of being a significant actor in the Syrian political theatre. However, the Syrian war eruption and the rise of ISIS opened a new chapter for the PYD and its military wing, the People’s Protection Units (YPG). Specifically, the Kobane War in 2014 became a turning point for the PYD in its relationship with the USA. Given the PYD’s intimate relationship with the Kurdistan Workers’ Party (PKK), Washington has started forcing the organization to transform itself into a more local organization due to legitimacy concerns. Thus, over time the party started attempting to gain political and societal legitimacy in the eyes of the Kurdish population along with different segments of Syrian society and garner as much support as possible from different layers of the country. The PYD also aimed at appealing to international actors through the transformation. In the context of its efforts to gain legitimacy, the party has established administrative and military structures that include different ethnicities and religions. The PYD/YPG has tried to eliminate legitimacy problems through attempts to localize (or Syrianize) itself. Therefore, in the quest to attain societal and political legitimacy, it has taken pragmatic steps towards this goal. Nevertheless, the party’s localization initiative remains inconclusive and currently faces various challenges.