This translates to the "Nobility Society of Mainz at Biebrich on the Rhein." The subtitle of the group is the tranlsation you list.

This was very interesting. I'm half-German from immigrants that arrived in Wisconsin in 1873 (where I was born some years later). I moved to Texas as a teen and had some fun times in Austin, San Antonio and tubing down the river in New Braunfels as a young man.

I've always wondered why there is a swath of Germanish towns in the middle of Texas. Now I know. Thanks so much!

33 claps for Griffyndor!