Mandela Meets Chiefs From His Tribe : South Africa: A delegation asks him to visit the graves of his relatives.

African National Congress leader Nelson R. Mandela met Tuesday with chiefs from his tribe and with a Swedish diplomat, and plans were made for him to travel to Zimbabwe and Zambia next week.

The National Reception Committee, which has coordinated Mandela’s schedule since he was released Feb. 11 after 27 years in prison, said he will go to Harare, Zimbabwe, on Monday. On Tuesday, he will go to Lusaka, Zambia, where he will meet with exiled ANC leaders.

Jan Lundvik, a representative of the Swedish legation in South Africa, said after a meeting at Mandela’s Soweto home that preparations are being made for his forthcoming visit to Sweden. ANC President Oliver R. Tambo, Mandela’s former law partner, is recovering from a stroke in Stockholm.

Chief Anderson Joyi, a leader of the delegation of chiefs from Tembuland in the Transkei homeland, said they had come to ask Mandela to visit the graves of his dead relatives in the Xhosa-speaking homeland. Mandela is a member of the Tembu royal clan of the Xhosa tribe and grew up in Transkei.

The South African government declared Transkei an independent republic during Mandela’s imprisonment for sabotage, but its military ruler is considering a referendum on rejoining South Africa.

Meanwhile, black nationalists pledged Tuesday to try to end a bitter war between their countrymen in South Africa’s Natal province. The conflict is a big obstacle to power-sharing talks with the white government.

The three groups, which are allied with the ANC, also said they would try to stop criminals from capitalizing on the conflict in Natal between the Zulu Inkatha movement and the ANC-allied United Democratic Front.

Future negotiations between the government and the ANC hinge on a resolution to the Natal fighting.

Pretoria says it will not end a 3 1/2-year-old state of emergency until the violence in Natal ends, while the ANC refuses to start talks on a new South African constitution until emergency rule is lifted.