This thesis explores the legitimacy of national libraries, by analysing the media's portrayal of the British Library during a major cyber attack by the Rhysida group in October 2023. Using diverse media sources, the research examines how media narratives reflect institutional pressures during prolonged disruption. The research employs a mixed-method approach, combining quantitative media coverage mapping with qualitative thematic analysis. The mapping categorises news articles based on content type, publication section, and perspectives represented. Thematic analysis identifies key themes such as the disruption of library services, cybersecurity concerns, and critiques of digital fragility. The findings reveal a complex interplay between the library's historical role as a national institution and its modern digital vulnerabilities. Additionally, the study discusses the broader implications of digital practices for the institutional identity of libraries, and the perceived responsibilities of national libraries in safeguarding cultural and intellectual heritage against cyber threats.