One by one, the aircraft arrived, each carrying a head of state. Waiting at Abu Dhabi's international airport on that warm May afternoon 40 years ago was another leader, the President of the United Arab Emirates.
Sheikh Zayed, the Founding Father, greeted them in turn – the Rulers of Saudi Arabia, Kuwait, Bahrain, Qatar and Oman.
From what is now Al Bateen Airport, convoys sped to the city's newest and most luxurious hotel, the InterContinental. In the middle of the ballroom, a round table had been set, ringed with large leather chairs.
It was there, at 7.55pm on Monday, May 25, 1981, that the charter was signed creating the Gulf Co-operation Council.
Sheikh Zayed opened that first 40-minute summit of the GCC. "What the Arab world expects of us is serious solidarity, co-operation and loyalty," he told his fellow leaders.
It was a declaration of intent but also of identity. The new symbol of the GCC, hanging on the wall of the InterContinental ballroom, showed the six nations united together in a map without boundaries.
Beyond those borders there was much disunity. Iraq and Iran were locked in a bloody war that would last for eight years. Within six months of the summit, Egypt's Anwar Sadat would be assassinated by army officers linked to the Muslim Brotherhood.
Two years earlier, other extremists had seized the Grand Mosque in Makkah and the Iranian Revolution swept aside the monarchy of the Shah and replaced him with supreme leader Ayatollah Ruhollah Khomeini.
Despite the region's vast oil and gas wealth, the GCC six were no match for the military power of the US and the Soviet Union, both of which saw the Gulf as strategically important to their own interests.
As the Kuwaiti newspaper Al Rai Al Aam reported: "The Gulf leaders know, we live in a wild world, one in which oil attracts sharks in the manner of blood."
Sheikh Zayed put the position of the GCC in more detail in an interview with Al Kaleej newspaper a few days later.
“We are entitled to our lands and properties and we shall combine all our efforts to protect our countries, our peoples and our security,” he said. “We don’t want any country, big or small, interfering in our affairs or conducting their conflicts on our soil, air and seas.”
Even as Ruler of Abu Dhabi in the 1960s, Sheikh Zayed had been aware of how vulnerable his country was. Negotiations that would eventually create the UAE 50 years ago this December originally included Bahrain and Qatar in the federation, until both countries decided to seek independence.
The seven Emirates of the UAE were a powerful message that unity is strength. The creation of the GCC would take this a step further.
The first moves towards a union of Gulf states began in 1977, with an approach to Sheikh Zayed by Sheikh Jaber Al Ahmad, the Ruler of Kuwait. Together, the two countries shared the idea with Saudi Arabia, Bahrain, Oman and Qatar.
All six Rulers who sat together in the ballroom of the InterContinental are now gone, the last being Sultan Qaboos of Oman, who died last year.
The organisation they created continues, with the 41st summit held this January in the Saudi Arabian city of Al Ula.
Since 1981, the GCC has endured testing times, with the Iran-Iraq War followed two years later by Saddam Hussein's invasion of Kuwait, a GCC member. Both the UAE and Saudi Arabia participated in its liberation.
The business of the GCC was dominated by security concerns in its first two decades. Peninsula Shield, a joint military force to deter aggression against member states, was created in 1984.
The council has increasingly moved forward in economic areas, including projects to link electricity grids and water supplies, and a Gulf railway.
Citizens of the six member countries also benefit from a single market that gives common access rights for employment, health care, retirement benefits, property ownership and education.
At the most recent summit, Secretary General Nayef Al Hajraf, of Saudi Arabia, underlined the organisation's economic power – a GDP of $1.6 trillion, and the sixth largest export market in the world at nearly $610 billion annually.
The most significant achievement of the GCC, though, may be that it gave a common voice to a corner of the Arab world once considered to be on the margin of the Middle East.
As Abdullah Bishara, the Kuwaiti diplomat and first GCC Secretary General, put it: “We strengthened the identity, the Gulf identity. There are now ‘Gulf’ people.
“We don’t make sweeping statements about being ‘Arabs’. There are Egyptians, there are Sudanese, and there is the Gulf.”