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Yiech Pur Biel fled his country of South Sudan as a child and was separated from his family. A decade later, they were reconnected when he became part of the first Olympic refugee team at the 2016 Rio Games, competing in the 800 metres. This week, he was named as a UNHCR Goodwill Ambassador as he continues to help others who've been displaced from their homes. Â鶹Éç Sport Africa's Celestine Karoney reports as part of our series on Africa's greatest Olympians. (Photo: Yiech Pur Biel. Credit: UNHCR)