Seven years into a war that has claimed hundreds of thousands of lives, Saudi Arabia and Iran now agree that the country's future can not be decided exclusively by the Assad regime, whose troops have regained the upper hand with massive support from Russian Federation. "East Jerusalem is an integral part of the Palestinian territories".
Discussions during the summit will shed light on the crisis in Syria following a tripartite strike by the US, France and the United Kingdom on several military and research targets in Syria.
Jerusalem remains at the heart of the Middle East conflict, with Palestinians hoping that East Jerusalem - occupied by Israel since 1967 - might eventually serve as the capital of a Palestinian state.
The heads of state of Arab League will discuss the civil wars in Syria and Yemen.
Opening the 29th Arab League summit, the Saudi King also criticised the U.S. decision to transfer its embassy in Israel to Occupied Jerusalem and described "terrorism" as the biggest challenge facing Arab leaders.
Speaking to the reporters in Mogadishu, the director of Villa Somalia, Abdinur Mohamed Ahmed said Somali delegates would be holding talks with other Arab leaders. Saudi Arabia's king turned his attention with long-time foe Iran - only 160 kilometres (100 miles) across the Gulf from Dhahran.
During the summit, Saudi King Salman bin Abdulaziz criticized Tehran's influence on Arab countries, claiming that it violated the principles of global law.
"We renew our strong condemnation of Iran's terrorist acts in the Arab region and reject its blatant interference in the affairs of Arab countries", the king said.
Arab ministers at a preliminary meeting in Riyadh on Thursday focused heavily on blocking the embassy move, unanimously condemning Trump's decision.
"The Palestinian cause has been and will always be our main cause until the Palestinians regain their rights", he said.
Saudi Arabia and Iran have for decades been locked in a struggle for regional supremacy that is now being played out in proxy wars in several countries, including Yemen and Syria.
All educational institutions have been declared close on Sunday for the 29th Arab League summit that opens in Dhahran on Sunday.
Iran is backing Shiite Houthis that Riyadh opposes in Yemen and on Sunday Salman praised "the U.N. Security Council's statement denouncing the Iranian-made ballistic missile fire on Saudi cities".
Qatar did not send a senior official, a sign that its 10-month-old dispute with Saudi Arabia, the United Arab Emirates, Bahrain and Egypt is still a long way from being resolved.
The Arab League was founded in 1945 to protect newly-won independence throughout the region.