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.
Coach Ekapol Chantawong, who was widely praised for keeping the boys safe after rain flooded the cave system, was rescued on the 18th day, along with the final three boys.
Mr Chantawong and three of the youngsters - who were all reportedly born in Thailand - were handed their citizenship cards in a ceremony on Wednesday.