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This study examines self-legitimation and other-delegitimation in the online radio broadcasts of Nnamdi Kanu, the Supreme Leader of the Indigenous People of Biafra (IPOB). Using Theo van Leeuwen’s (2008) legitimation approach, the paper analyses four speeches he delivered in Israel following his ‘reappearance’ in 2018. The analysis reveals that Kanu uses three legitimation strategies, namely authorisation, moralisation and rationalisation to justify his sudden escape from Nigeria, call for Biafra’s self-rule and boycott of elections and to discredit alleged cloning of the president, electoral malpractices, marginalisation of the Igbo and corruption and brutality among security agents. These strategies are linguistically realised by self-glorification, exclusive and inclusive pronominalisations (us-them dichotomy), polarisation, derogatory nomination (labelling), and hyperbolic expressions. They are aimed at presenting …