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Isac Hallard / Isaak Hallardt born 19 December, 1780 in Stockholm, Sweden, baptised 21 December, 1780 in Jokobs Kyrka (St. James Church), in Stockholm. Parents: Johan Abraham Hallardt, mother: Anna Helena, born Lundgren. Married Anna Rebekka Ralle in Ritzebuettel-Cuxhaven, Lower Saxony, Germany, he was a saddle-maker by trade. Their daughter Johanna Christina Dorthea Hallardt, born 1816 in Ritzebuettel-Cuxhaven married Heinrich Wilhelm Christoph Heitmann on 14 August, 1845 in Ritzebuettel-Cuxhaven, Kreis Cuxhaven, Lower Saxony, Germany.
Siblings of Isaak were: Johan Laurentius Hallardt (1777), Maria Sophia (1782), Helena Elisabeth (1784), Jacob (1786), Johan Fredric (1788) Parents were Johann Abraham and Anna Helena Hallardt, born Lundgren. They were married on 28 March, 1776, in Klara Forsamling, Stockholm. Klara Kyrka or Clara's Church in the inner city.