In late 2015, the Syrian Interim Government relocated its headquarters to the Turkish-occupied areas in North Syria and began to execute some authority in the area. In 2017, the opposition government in the Idlib Governorate was challenged by the rival Syrian Salvation Government, backed by the Islamist faction Hayat Tahrir al-Sham (HTS). A July 2015 ORB International poll of 1,365 adults across all of Syria's 14 governorates found that about 26 percent of the population supported the Syrian opposition (41 percent in the areas it controlled), compared to 47 percent who supported the Syrian Arab Republic's government (73 percent in the areas it controlled), 35 percent who supported the Al-Nusra Front (58 percent in the areas it controlled), and 22 percent who supported the Islamic State (71 percent in the areas it controlled). A March 2018 ORB International Poll with a similar method and sample size found that support had changed to 40% Syrian government, 40% Syrian opposition (in general), 15% Syrian Democratic Forces, 10% al-Nusra Front, and 4% Islamic State (crossover may exist between supporters of factions). Syria has been an independent republic since 1946 after the expulsion of the French forces. For decades, the country was partially stable with a series of coups until the Ba'ath Party seized power in Syria in 1963 after a "coup d'état". The head of state since 1971 has been a member of the al-Assad family, beginning with Hafez al-Assad (19712000). Syria was under emergency law from the time of the 1963 Syrian coup d'état until 21 April 2011, when it was rescinded by Bashar al-Assad, Hafez's eldest surviving son and the current President of Syria. As the revolutionary wave commonly referred to as the Arab Spring began to take shape in early 2011, Syrian protesters began consolidating opposition councils. The Istanbul Meeting for Syria, the first convention of the Syrian opposition, took place on 26 April 2011, during the Syrian civil uprising. There followed the Antalya Conference for Change in Syria or "Antalya Opposition Conference", a three-day conference of representatives of the Syrian opposition held from 31 May until 3 June 2011 in Antalya, Turkey. Organized by Ammar al-Qurabi's "National Organization for Human Rights in Syria" and financed by the wealthy Damascene Sanqar family, it led to a final statement refusing compromise or reform solutions, and to the election of a 31-member leadership. After the Antalya conference, a follow-up meeting took place two days later in Brussels, then another gathering in Paris that was addressed by Bernard Henri Levy.