Martijn de Marcas was a son of David de Marcas and Betje van Dam.
He married Estelle Reine Vos in 1884 in Rotterdam.
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In June 1941, an obituary was placed in Het Joodsche Weekblad for Martijn de Marcas. He was a Knight in the Order of Leopold II of Belgium. From Amsterdam, he was buried in the Putte cemetery. This was the Jewish cemetery at the Belgian border, …