Prince Carl (Karl) of Solms-Braunfels was a German prince and military officer in both the Austrian army and the cavalry of the Grand Duchy of Hesse. As commissioner general of the Adelsverein, he spearheaded the establishment of colonies of German immigrants in Texas. Prince Solms named New Braunfels, Texas, in honor of his homeland.

The Mainzer Adelsverein at Biebrich am Rhein, better known as the Mainzer Adelsverein, organized on April 20, 1842, was a colonial attempt to establish a new German settlement within the borders of Texas.