[3] Lamoureux first appears around 1664 in Stockholm with his stepfather, the sculptor Jean Baptiste Dieussart,[5] when the latter entered service with count Magnus Gabriel De la Gardie, the Lord High Chancellor of Sweden, who was his stepfather's main employer and patron until around 1668.

[8] Around 1670 he was an apprentice of the sculptor Nicolaes Millich and lived with him in Stockholm's Bonde Palace,[9] but absconded to Güstrow to his stepfather's brother Charles Philippe Dieussart,[3] who at the time was court architect and sculptor of Duke Gustav Adolph of Mecklenburg, and in 1671 Lamoureux, like his stepfather before him, entered the service of count Magnus Gabriel De la Gardie.

[5] Early in 1675 Lamoureux married Anna Thiel, a daughter of Hans Thiel, farrier and Elder of the guild of weaponsmiths,[1] and in 1677 he became court sculptor for Queen Hedvig Eleonora at Jakobsdal Palace, in September 1678 he was contracted by his former employer, De la Gardie, to create sculptures of two seahorses, a Neptune and a dragon for Karlberg Palace.

[10] In 1681, Abraham César Lamoureux and his family, including his brother Claude his sister Magdalena and her husband, the Swedish sculptor and stonemason Johann Gustav Stockenberg,[3] moved to Copenhagen in Denmark (it has been speculated that Lamoureux was convinced to leave Swedish Service by Jens Juel)[4] to become court sculptor for Christian V of Denmark,[2] where he received an annual salary of 400 rigsdalers, which was topped up by an additional 200 rigsdalers from 1685.

[1] He is likely to have started work on the Equestrian statue of Christian V around 1682, when he first purchased materials for its creation,[2] and 1687 its installation on Kongens Nytorv was witnessed by Nicodemus Tessin the Younger.