As a pianist Toselli made many travels through Europe and the United States. Of his compositions, which he originally wrote was Serenatafor piano and violin, a true world hit. He has his greatest fame, however, due to the love affair he had with the Saxon Crown Princess Louise. She left her husband for him even, the last Saxon King Frederick Augustus , and their six children. in 1907 married thirteen years older Toselli with the Princess. The couple had also on May 7, 1908 was a child before the marriage: Carlo Emanuele Toselli stranded after five years.