He belongs to the earliest identifiable professional actors active in Sweden, was the leader of the theater of the Swedish royal court in 1628-1645, and the founder of the likely first theater in Sweden and Scandinavia, Björngårdsteatern (1640).
[2] Christian Thum performed a theater play for queen Maria Eleonora of Brandenburg in 1628.
In 1637, he was transferred to the court of queen Christina of Sweden and is explicitly named director of the royal court theater: the regency government regarded a theater as a useful pedagogic method for the child monarch, and Thum had the monopoly of theater performances at the royal court.
Christian Thum bought the tavern Björngårdsteatern in 1640 and was given permission to stage theater there, though nothing is known of this activity either.
The last theater performance staged at the royal court by Thum was in 1645: three years later, three foreign theater companies performed in Stockholm, followed by a number of English, German, Dutch and Italian companies, and the monopoly of Thum is estimated to have been discontinued.