Ernestine duchies
After the division of the first Altenburg lands line, the senior Ernestine branch (the Saxe-Weimar family ), line held just under half of the Ernestine lands, and the junior, Gotha-Altenburg, line held more than half. Gotha-Altenburg line divided more each generation.  The Weimar line did not subdivide their land and by 1741 all of the land was controlled by the one branch of the Weimar family.  In 1815 they became Grand Dukes.