Emilio De' Rossignoli
De Rossignoli, Emilio
July 3, 1920 – December 28, 1984 (aged 64)
Birth place: Lussinpiccolo (today Mali Lošinj, Croatia)
Journalist and writer, mainly of thriller stories, used many pseudonyms. Photographs can be seen at the linked site mattatoio5.com, where it is also stated that the legal name is spelled "De" but he often signed as "De'", which hints for noble origins.