Original: In c 1640 , the remaining brothers finally divided their patrimony , William remaining in Weimar , Albert ( Albrecht ) receiving seat as Duke of Eisenach and Ernest ( by-named '' the Pious '' ) also got his share and became known as Duke of Gotha .
Simplified: William kept Weimar , Albert became Duke of Eisenach and Ernest '' the Pious '' became known as Duke of Gotha .