Martinus Klaasz Barnhoorn
- Born: 1790, Noordwijk, Zuid-Holland
- Marriage (1): Maria van der Ploeg on 13 Aug 1820 in Noordwijk, Zuid-Holland
- Marriage (2): Aaltje Leendertsdr Wassenaar on 28 May 1814 in Noordwijk, Zuid-Holland
- Died: 1849, Noordwijk, Zuid-Holland at age 59
Martinus married Maria van der Ploeg on 13 Aug 1820 in Noordwijk, Zuid-Holland. (Maria van der Ploeg was born in 1802 in Voorhout, Holland, christened on 26 May 1802 in Sassenheim, Holland and died on 24 Mar 1852 in Noordwijk, Zuid-Holland.)
Martinus next married Aaltje Leendertsdr Wassenaar on 28 May 1814 in Noordwijk, Zuid-Holland. (Aaltje Leendertsdr Wassenaar was christened on 24 Apr 1793 in Noordwijk, Zuid-Holland and died on 16 Jul 1816 in Noordwijk, Zuid-Holland.)
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