She then continued to rule as regent for his son Charles II , who was held with his sister Philippa by the Burgundians .
But the regency lasted much longer than expected because Adolf was killed in battle on June 27 , 1477 .
She then continued to rule as regent for Adolf 's son Charles II , who was held with his sister Philippa by the Burgundians .
But the regency lasted much longer than expected because Adolf was killed in battle on June 27 , 1477 .