Jacobus was still alive in 1733:

Monsterrol 1733

't Caabse District 'Jacobus Stijn & Maria Potgieter'

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NOTE: Reliable dates of birth of his children are found in recent publications only. Older publications about the Steyn family tree have big mix-ups here.

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Jacobus is probably not the biological son of Douwe Gerbrandt STEYN. He was probably fathered by another man. But Jacobus took on the surname of STEYN because Douwe Gerbrandt STEYN adopted him as his son. Therefore, Jacobus was mentioned in Douwe's testament.

Thus Jacobus is the biological Stamvader of the majority of the STEYNS in South Africa.

We start by numbering Jacobus as b1 as he is the first legal son of Douwe Gerbrandt STEYN in South Africa. There is still discussion going on whether the SV/PROG had one or two sons in Friesland before he came to South Africa. If one son there, then b2 would be correct; if two sons, it should be b3. On Geni we use b1 (see Curator Note on the top of the profile page)

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Note by Lodewyk Christiaan 'Chris' STEYN

If enough STEYN descendants have their genealogical DNA tested with http://www.familytreedna.com/ or a similar company, we will not only be able to trace our common ancestry, but we might also be able to discover who the biological father of Jacobus was. Until now that has been a mystery, but with genealogical DNA testing, we might be able to solve the puzzle since the number of males in the Cape at the time were very limited.

So: if at all possible, please do the test with familytreedna

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Jacobus was probably born two years before his mother married Douw Gerbrand STEYN.

Baptized 29 August 1683

Steyn,Jacobus = Kaapstad, doopgetuie juffrou Coon 29.08.1683 :­sy vader is onbekend, het die van, Steyn, van sy stiefpa aanvaar [278] source - http://members.aol.com/kmeintjes/Genealogy/FWdeKlerk.htm Juffrou Coon was die weduwee van Johannes Coon wat 'n vername betrekking by die Kaapstadse garnisoen beklee het

Married Maria Potgieter 24 October 1706

Owned the property 'Welgemeend' which is where Kampstreet is in Cape Town now.

Was a butcher and brewer of brandy.

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Jacobus was the actual progenitor (stamvader) of the Steyn family in South Africa. He was adopted by Douwe Steyn in 1685 age 2 and was given the ancestral number b1 by Pama II.

No-one is exactly sure who his father was. He was adopted by Douwe Gerbrandts Steyn when he married his mother, Maria Lozee. He then took on the surname Steijn. He was baptised in 1683 (according to De Villiers) or 1685 (according to Heese). Christening 29 August 1683? If he was indeed baptised in 1685, there is a possibility that Douwe was his father and that it was a forced marriage.

There has also been some speculation that his father might have been the father of Alexandrina (Sandrina) Maxwell, whose husband bought Maria as slave.

He was a free burgher and later a butcher.

De la Fontaine describes him as a poor man.