"Jan Jansz Onderhill (Onderberch), young man, cadet under the guard of His Excellency the Prince of Orange, was married in the Kloosterkerk, by Dom. Ludovicum, Dec. 12, 1628, to Heylken, daughter of William de Hooch of Gorinchem, both residing at the Hague." (Extract from the Marriage Record of the Ministers of Kloosterkerk, 1624-1628, at The Hague.)