In February 1987, the Prince and Princess of Wales visited Portugal. The visit had been arranged to coincide with the anniversary of the signing of the Treaty of Windsor in 1387 which had bound Britain and Portugal in "perpetual friendship". The Prince and Princess of Wales attended a banquet held in their honour by President Mário Soares at the Ajuda National Palace. In 1987, Charles and Diana were also invited to visit Germany and France to attend the Cannes Film Festival. In 1988, the Prince and Princess of Wales visited Thailand and also toured Australia for the bicentenary celebrations. In 1989, the couple were invited to visit the Arab States of the Persian Gulf, where they met with the British citizens, visited Schools of British Scots in the region and joined members of the royal families in state dinners and desert picnics. The tour began in Kuwait and they stayed in the As-Salam Palace at Shuwaikh Port as guests of the Kuwait Government. During their visit, they had an audience with the Emir of Kuwait, followed by lunch. They also had an audience with the Crown Prince and Prime Minister of Kuwait, who hosted a dinner in their honour. Diana was also given a chest full of gold jewelry, a silver tea set and a gold embroidered Bedouin gown. During their tour in Kuwait, the Princess visited The Kuwait Handicapped Society, reflecting her ongoing interest in children and their needs. In Saudi Arabia, the Princess was invited to King Fahd's palace, a rare honour for a woman. In Oman, Sultan Qaboos presented Diana with a Queen's ransom in jewels. The tour finished in United Arab Emirates.