Thailand has granted citizenship to the coach and three members of a football team dramatically rescued from a flooded cave last month.
During their ordeal, it emerged that the boys and their coach were among around 480,000 stateless people living in the south-east Asian country.
It prompted calls to fast-track their citizenship applications.
The four were part of a 13-strong team, known as the Wild Boars, who became trapped deep in a cave on 23 June.
They were found by two British divers nine days later, but it took another six days to rescue the first team members.
Many of Thailand's stateless people are from nomadic hill tribes and other ethnic groups who have lived around the borders of Thailand, Myanmar, Laos and China for centuries.
The UN refugee agency believes the group number about 480,000.