Jacob Lopes de Leaô was a son of Baruch Lopes de Leaô and Frederika Crost. Jacob Lopes de Leaô was a member of a resistance group that operated in the Gooi-region and around the town of Heemstede. As a consequence of his resistance activities Jacob Lopes de Leaô was arrested on 26 May 1941.
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Jacob Lopes de Leaô married in 1927 and had a child.
Stadsarchief Amsterdam, archiefkaart Jacob Lopes de Leaô