In 1722, he then moved to Bonn entirely. After the death of the Elector in 1723, he was taken into the service of the succeeding Elector Clemens August of Bavaria. In 1728, Leveilly was appointed sub-architect and was also responsible for the gardens, then in 1733 he became senior architect.[1] There, Leveilly was mainly active as executive architect, realizing the plans of François de Cuvilliés, but also contributing and implementing his own ideas, especially for the interior finishes.[2] In addition to his work as court architect, he also worked for the city of Bonn, whose Old City Hall he planned and built.[1]
On 10 February 1722, he married Anna Maria Seron (1700–1741) in St. Remigius. The couple had nine sons and six daughters. In his second marriage, Leveilly took on 5 December 1743 in the Bonn parish church St. Gangolf Agnes Gladbach to wife.[2]
^Cornelia Kirschbaum: Wohnbauten des Hofadels in der kurkölnischen Residenzstadt Bonn im 17. und 18. Jahrhundert (Georg Satzinger (ed.): Tholos – Kunsthistorische Studien, vols 10.2). Rhema-Verlag, Münster 2019, ISBN978-3-86887-031-2, pp. 195–196. (in the same time, Dissertation for the Bonn University, 2016)
