Simon Moritz was born in Nassau, northwest of Frankfurt am Main, the youngest son of the identically named Nassovian administrator Simon Moritz Bethmann (1687–1725).
Byl jedním ze čtyř synů bankéře Simona Moritze von Bethmanna. Sám se věnoval bankéřské činnosti a pobýval zčásti ve Frankfurtu, zčásti na svém statku v Křinci u Nymburku v Čechách, kde se s úspěchem zabýval chovem koní.
The Bethmann family (/ ˈ b ɛ t m ɑː n/; BET-mahn) has been remarkable for the high proportion of its male members who succeeded at mercantile or financial endeavors.
The Bethmann family in Germany, originally from Goslar, achieved greatest prominence in Frankfurt am Main; the Bethmann-Hollweg sideline produced a German chancellor.
While the brothers Johann Philipp and Simon Moritz established the Gebrüder Bethmann bank based on their uncle's inheritance, Johann Jakob moved to Bordeaux in 1740, where he established Bethmann & Imbert (since 1779 Bethmann & fils) as a…
Simon MoritzvonBethmann war der Sohn Johann Philipps. Er trat 1791 in die Führung des Hauses ein und wurde nach dem Tod seines Vaters 1793 alleiniger Inhaber.