House of Saxe-Coburg and Gotha
The family divided into two ruling branches in 1485 by the Treaty of Leipzig: the Ernestine and Albertine branches. The older Ernestine branch played a key role during the Protestant Reformation. Many ruling monarchs outside Germany were later tied to its cadet branch, the House of Saxe-Coburg and Gotha. The Albertine branch, while less prominent, ruled most of Saxony and played a part in Polish history.