[6] In the charter of January 1349, by which Margaret II, Countess of Hainaut handed Holland and Zeeland to her son William V, Jan is mentioned in the typical medieval fashion.

[7] The person missing in the above charter is Sir Arnoud van Haamstede Lord of Moermond, Jan's uncle.

They started in earnest in August 1350, when Delft and most of the Holland cities rebelled against Margaret of Hainaut.

The only major cities that held Margaret's side were Dordrecht, and in Zeeland: Zierikzee.

On 21 January 1351 Jan and Floris van Haamstede were in Zierikzee and promised to keep Margaret's side.

[11] Shortly after the verdict, the Van Borselen's and Middelburg rebelled, and joined the Cod side.

[6] In December 1368 Count Albert made a favorable provision for Jan and his wife after the death of her father Rase van Kruiningen.

Out of the dowry of Jan's wife, he granted 2,500 gemets (comparable to acres) of land to their children after their death.

[12] In 1377 Jan was a witness to the marriage contract between Albert's daughter Catharina and the Duke of Guelders.