July 11, 1635, Naumburg, Saxony.
September 8 or 18, 1699, Wolfenbüttel, Germany.
Gottfried was the son of Andreas Sacer, senior Burgermeister of Naumburg.
He entered the University of Jena in 1653, studying law there four years.
He then worked two years as secretary to Geheimrath von Platen in Berlin, then as a tutor: First to a son of Swedish Regierunsrath von Pohlen, then to the sons of Saxon Landhauptmann von Bünau.
In 1665, he entered military service under Herr von Mollison, commandant at Lüneberg, at first as regimental secretary, and afterwards as ensign.
Tiring of the military, he went to Kiel in 1667 get his LLD degree, but before doing so toured Holland and Denmark with some young noblemen from Holstein.
In 1670, he settled down as advocate at the appeal and chancery courts in Braunschweig (graduating LLD at Kiel in 1671).
In 1683, he moved to Wolfenbüttel as Kammer-und-Amts-Advocat, receiving the title of Kammer-Consulent in 1690.