Born in Lisbon in 1850 to German parents, Keil was a true Renaissance man of the 19th-century Portuguese cultural scene, distinguishing himself as a prolific composer, painter, and passionate art collector.

Keil’s defining historical contribution came in the wake of the 1890 British Ultimatum, a moment of profound national humiliation that ignited fierce patriotic fervour across Portugal. Moved by the political tension, poet Manuel Alegre's father wrote the defiant lyrics, and Keil composed a fierce, marching melody designed to rally the nation. Originally titled "A Portuguesa," the song quickly captured the public’s imagination as a symbol of resistance. Though initially banned by the monarchy for its revolutionary undertones, it was officially adopted as the national anthem in 1910 following the establishment of the Republic.

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Beyond his musical legacy, Keil was an accomplished landscape painter and a pioneering figure in Portuguese archaeology - talk about Variety! Today, Keil’s enduring cultural footprint lives on every time the nation sings out in unity.