Born: November 5, 1866, Ystradgynlais, Breconshire, Wales.
Died: February 25, 1934, Chicago, Illinois.
Buried: Forest Hill Cemetery, Scranton, Pennsylvania. The Scranton Times is said to have incorrectly reported his burial place as Dunmore Cemetery (also near Scranton).
Daniel was the son of grocer Daniel Prothero and Eleanor Williams, and husband of Hannah Harris.
He attended the Normal College in Swansea, early became a competitor in eisteddfods, and organized his first choral society at age 16.
He emigrated to Scranton, Pennsylvania, in 1885. He graduated in music in 1890, and later earned a doctorate.
He conducted various choral societies at the Scranton Cymmrodorion Choral Society; Milwaukee, Wisconsin; and Chicago, Illinois, where he lived until his death, teaching at the Sherwood Music School. He was also music director of the Central Church in Chicago.
He visited Wales frequently to adjudicate and conduct, and is remembered as a composer of anthems and hymn tunes.
If you know where to get a good photo of Prothero (head & shoulders, at least 200×300 pixels),