Born Henriette Seyler in the city-republic of Hamburg, she was the youngest daughter of the banker L.E. Seyler and Anna Henriette Gossler, and a granddaughter of the Swiss-born theatre director Abel Seyler and of the Hamburg bankers Johann Hinrich Gossler and Elisabeth Berenberg, whose Belgian-origined family had founded Berenberg Bank in 1590.
Her father L.E. Seyler was a co-owner of Berenberg Bank for 48 years as well as President of the Commerz-Deputation and a member of the Hamburg Parliament, and her family was one of Hamburg's most prominent Hanseatic families.
On her father's side, she was a descendant of the Swiss Calvinist theologian Friedrich Seyler and of the Basel patrician families Burckhardt, Socin, Merian, Faesch and Meyer zum Pfeil; on her mother's side she was also descended from families like Amsinck and Welser.

The year after her birth, Hamburg was occupied by Napoleonic France and then briefly incorporated into the Bouches-de-l'Elbe département of the French Empire, before again becoming a sovereign city-republic after the Napoleonic Wars.
During the French occupation, her father was held as a hostage along with a handful of the city's other prominent merchants for some time, and Berenberg Bank later moved its headquarters to their private home.
Like most of Hamburg's elite, the family was fiercely Anglophile.
Born Henriette Seyler in the city-republic of Hamburg, she was the youngest daughter of the banker L.E. Seyler and Anna Henriette Gossler, and a granddaughter of the Swiss-born theatre director Abel Seyler and of the Hamburg bankers Johann Hinrich Gossler and Elisabeth Berenberg, whose Belgian-origined family had founded Berenberg Bank in 1590. Her father L.E. Seyler was a co-owner of Berenberg Bank for 48 years as well as President of the Commerz-Deputation and a member of the Hamburg Parliament, and her family was one of Hamburg's most prominent Hanseatic families. On her father's side, she was a descendant of the Swiss Calvinist theologian Friedrich Seyler and of the Basel patrician families Burckhardt, Socin, Merian, Faesch and Meyer zum Pfeil; on her mother's side she was also descended from families like Amsinck and Welser.
The year after her birth, Hamburg was occupied by Napoleonic France and then briefly incorporated into the Bouches-de-l'Elbe département of the French Empire, before again becoming a sovereign city-republic after the Napoleonic Wars. During the French occupation, her father was held as a hostage along with a handful of the city's other prominent merchants for some time, and Berenberg Bank later moved its headquarters to their private home. Like most of Hamburg's elite, the family was fiercely Anglophile.
Henriette Wegner