A24-9 in The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766.
B-427 in The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766.
Rus14-13 in The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766.
Family #11 in 1775 Grimm census.
Family #8 in the 1798 Grimm census appendix.
Family #62 in the 1834 Grimm census.
Johann Martin Fritzler was the first child of Jacob and Catharina Fritzler.
Birth Record #1 
Birth Record #2 
Martin was born in Württemberg, Germany during a time when many families in that area were struggling to survive. The economic conditions in Württemberg mid-1700s were poor, due to war, famine, high taxes and burdensome tithing expected by the local Church. As a farmer, his father had difficulty feeding his children and poor prospects for the future.
In 1759, the Danish government offered these disadvantaged Germans a chance for a new life in Denmark, helping to farm what was currently unfarmable land.  Those who chose to immigrate would be given an opportunity for a brighter future via homesteaded land or through a land lottery.
Johann Martin's parents and six of his siblings arrived in the city of Altona, the processing site for Germans immigrating to Denmark, on 30 June 1761.  They arrived in the town of Schleswig in Denmark on 04 July 1761. Seven days later, his youngest sister was born.
His parents and oldest brothers took their oath of allegiance to Denmark on 24 July 1761. In December of that year, the family lived at 3 Christianshof, Christians Thal, in the district of Flensburg. After nearly four years of unsuccessful farming and after Catherine the Great issued her invitation for Germans to immigrate to Russia, Johann Martin's father requested to leave Denmark on 24 April 1765.
Since they arrived in Russia earlier than 1766, they were first settled in one of the existing Volga colonies, like Dobrinka. Those first few years were very rough on the settlers. Cossacks, bandits, and other migratory people routinely plundered the new villages and killed many of the villagers. The villagers' plight did not improve until after 1765 when the Cossack bandit Pugachev was captured and hung. The arrival of additional immigrants also helped the villagers be better able to defend their property and lives.
1775 Grimm Census 
By the time the 1775 census was taken for the village of Grimm, his mother was listed as a widow with four older children still living with her. It is not clear at this point whether three of his siblings perished, or if they were old enough to be married and/or given property separate from their mother's land. His father died prior to 1775, but the manner of death is not given. There are several ways he may have perished:
In the 1798 census, he is one of 14 immigrants who is listed as having paid his debts and could live freely in Russia, anywhere. He chose to remain in Grimm.
1798 Grimm Census 
Also by the time of the 1798 census, his first wife Christina had passed away and he had remarried Anna Maria Kunau. Anna Maria does not appear in the 1834 census and most likely passed away before that year.
According to the 1834, Martin Fritzler had adopted a son into his family, Valentin Werd. Valentin's wife, however, was Anna Regina Fritzler, Martin Fritzler's granddaughter through his son Martin Jr. The most likely scenario is that Martin Jr., passed away before 1816, pre-deceasing his father. There must have been no other male heirs, so Martin Sr.'s oldest granddaughter, by that time married to Valentin Werd, moved into her grandfather's household and she and her family helped care for the Fritzler land. After Johann Martin Sr.'s death, her husband Valentin Werd became the head of the Fritzler household #62.
Johann Martin Fritzler remained in Grimm until his death in 1817.
1834 Grimm Census 
In this census, it says that Valentin Ward was Martin Fritzler's son. Unless Martin Fritzler adopted him, he was actually Martin's son-in-law, married to his daughter Anna Regina. All of their children are actually Martin's grandchild. I have made the corrections to the layout of this census entry here so there is less confusion regarding the people in the household and their relationship to Martin Fritzler.
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