10 July 1631, Leeuwarden– April 1700[1]) was overseer of the Moederkerk, Stellenbosch in 1686 and City Engineer of Cape Town from 1697.

The book "Die Groot Afrikaanse Familie Naamboek" states that his predecessor as City Engineer of Cape Town was Oldenland when the only Oldenland at the Cape at that time was Henrik Bernard Oldenland, a botanist.

When Steyn came to the Dutch Cape Colony in 1672 as a widower he already had 2 sons, Age (1661-1727) and Gerben (1663-1672), who never came to South Africa.

He married Maria Lozee in 1685 when she already had a son named Jacobus, who later took the surname Steyn.

So Jacobus had to have been the progenitor of the Steyn family of South Africa, even though his real father is unknown.