Merchant from Ratibor.

JRI says he was aged 22 years when he married in 1859 (so born 1836-37) which is compatible with the dob given by grizim (21.08.1836). Nachfahren von Jacob Weissenberg und Rosalie Deutsch by Hilde Gerrard neé Weissenberg gives a dob of 1826. JRI also says that his mother was aged 20 years when she married in 1835 (so born 1814-15), which is incompatible with Markus being born in 1826, when she would have been aged 11 - 13 years old.