Hans Jacob Holtzklau, born in 1683 in Trupbach, was the youngest child of Hans Heinrich Holtzklau and Gertrud (maiden name uncertain). He was baptized in Nikolaikirche on Laetare Sunday, March 28, 1683, the fourth Sunday of Lent. Like his brother Johannes and his father Hans Henrich before him, Hans Jacob was a schoolteacher. On August 8, 1708, in Siegen, he married Anna Margretha Otterbach (born 1686), daughter of Hermannus Otterbach of Trupbach and his wife Elisabeth Heimbach. In 1708, Hans Jacob became the schoolteacher at Oberfischbach following the death of his brother, Johannes, who had been the schoolteacher there.