In March 1990, she joined the Prince of Wales to tour Nigeria and Cameroon. During their tour, the Princess visited children's hospitals, traditional hand-loom weavers and women's development projects. The President of Cameroon later hosted an official dinner to welcome them in Yaoundé. In May 1990, they undertook an official visit to Hungary. The royal couple were met at the airport by their host, newly elected interim President Árpád Göncz. President Göncz later hosted an official dinner to welcome the royal couple. During their four-day trip, the couple met with government officials, business officials and artists and the Princess viewed a display of British fashion at the Museum of Applied Arts. In November 1990, the royal couple went to Japan to attend the enthronement ofEmperor Akihito. In 1991, the Princess went with the Prince of Wales and her children to undertake an official visit to Canada to present replica of Queen Victoria's Royal Charter to Queen's University, on the 150th anniversary of the university's 1841 founding. In September 1991, the Princess visited Pakistan. During her visit, Diana helped the needy families in Lahore, met with Islamic scholars and students. In that year, they also visited Brazil. During their tour in Brazil, Diana visited the orphanage and an Aids Treatment Centre for children. She also met the Brazilian President Fernando Collor de Mello and First Lady Rosane Collor in Brasília. Their last joint overseas visits were to India and South Korea in 1992.