November 14, 1901: The viennese physician Karl Landsteiner announces the discovery of the blood groups A, B and 0.
And on my family tree?
Johann Joachim Heinrich GREVE is born on November 14, 1846 in Upahl, Mecklenburg-Schwerin, Germany. He is the third of four children from Hans Joachim GREVE and Catharina Margaretha VASELT.
On February 7, 1873 he marries Catharina Elisabeth Maria KÖRNER in Diedrichshagen, Mecklenburg-Schwerin, Germany a famer’s and vestryman’s daughter from Upahl.
I couldn’t trace any children of the two of them yet, but that is already on my to-do-list. This is getting longer and longer by the way ;)
The 1900 census of Mecklenburg-Schwerin shows Johann living as a farmer in Upahl.
And what happened to him in the new century? I don’t know yet, I have to take a closer look.