When he was 8 years old, his family immigrated to Denmark.
For a discussion about the circumstances surrounding that move, see his father Matthias Gula's profile.
His family departed Denmark in 1765, but it's unclear if they went back to Germany or directly on to Russia. The journey to the Volga was known for being grueling and unforgiving, and many immigrants did not survive it.
While Johann Peter was clearly the son of Volga German immigrants, it's not clear whether or not he survived the journey to the Volga. He may have passed away during the journey or some time after his family arrived in Grimm but before 1775. He is not specifically mentioned in the 1775 census, although his parents and younger brother are.
Head of the Household Matthias Gula [Hula?], age 50
Wife Magdalena Gula, age 52
Child #1 Jakob Gula, age 14
If he survived, he would have been 22 years old in 1775, probably married, and living in another village.
Lutherische Kirchenbücher, 1502-1985, Ancestry.com. Baden, Germany, Lutheran Baptisms, Marriages, and Burials, 1502-1985 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2016. Original data: Mikrofilm Sammlung. Familysearch.org. Originale: Lutherische Kirchenbücher, 1502-1985. Birth record for Johann Peter Gula.
Eichhorn, Alexander, Dr., and Dr. Jacob and Mary Eichhorn. The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766, Druck and Bindung: Druckerei and Verlap Steinmeier GmbH & Co. KG, 86738, Deiningen, Germany; Published 2012; pages 270, 426, and 674.
↑The 1775 and 1798 Census of the German Colony on the Volga, Lesnoy Karamysh, also known as Grimm; Published by the American Historical Society of Germans from Russia, Lincoln, Nebraska, USA; Published date: 1995; family #9 in the 1775 census, Matthias Gula family.