Jan I was lord of Heukelom. He was mentioned in a charter in 1293 as "Knape". Some sources claim he became Knight in 1301. Probably born around 1258, married around 1280 and passed away around 1312.
He had at least four children:
Arend van Heukelom
Otto van Heukelom (Charters 1299-1345), lord of Heukelom
Vermeulen, H. J. J. (2020). Bouwsteen en Toetssteen: Een overweging van de bronnen en methoden van de genealogie gecentreerd rond het Gelderse geslacht De Cock. Rijksuniversiteit Groningen. Download Version
Vermeulen, Henri J.J., 2020, "Replication Data for: Bouwsteen en Toetssteen", DataverseNL, V1
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