Amadeo de Souza-Cardoso was a Portuguese artist and a friend of
Amedeo Modigliani.

Antoni Gaudí, architect of the extraordinary Sagrada Familia in Barcelona, met the 26 year-old painter in 1914 and soon thereafter Souza-Cardoso
had his vision of Quixote.
[Below]

He died 4 years later
of the Spanish flu.

I believe he would have
become incredibly famous
had he lived to old age.