Jan Ockersz. Besemer

IIA. Jan Ockersz. Besemer, was born in 1365 in Dordrecht. He died in 1422 in Oud Alblas.

He got 2 children:
1. Ave II.

2. Jan IIB.

    He got a child:
    1. Heynrick Jansz Besemer, born 1440 in Henrik Ido Ambacht, died 1520.


Source:
Among other things by reading:
"This whole brave family... A Schiedams genus Bes(z)emer between 1600 and present", from Th. Bezemer july 1988.