Franquemont was the son of an illegitimate union of Charles Eugene, Duke of Württemberg (1728-1793) and the dancer Regina Monti.
Beyer was trained as a garden-engineer early on by his father Johann Nicholas Beyer, who was a gardener in the service of Charles Eugene, Duke of Württemberg.
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In 1792 Albert married Eleanore, Baroness de Franquemont, (1771-1833) an illegitimate daughter of the reigning Duke of Württemberg by the Italian adventuress Anne Franchi.
The ambassador to the Vatican of Württemberg’s Duke Carl Eugen, Gaetano Marini, recommended Isopi to the duke as an ornament designer and animal sculptor.
Between 1751 and 1759 Karl Eugen was involved in an increasingly bitter struggle with his adviser, the eminent Liberal jurist Johann Jakob Moser who strongly opposed the Duke's absolutist tendencies.
In 1776 Duke Charles recalled him to Stuttgart, where he taught for nine years, and whence he was summoned to Paris to engrave a portrait of Louis XVI, after Joseph Duplessis.
At Wachau, during the Battle of Leipzig, his corps along with François Étienne de Kellermann's IV Cavalry Corps and the dragoons of the Guard charged the center of Duke of Württemberg.