Question

Was a painting, an opera with music by Arthur Sullivan, and a libretto by Julian Sturgis.

Answer 1

IVANHOE was a painting, an opera with music by Arthur Sullivan, and a libretto by Julian Sturgis.

IVANHOE was a historical novel by Sir Walter Scott. It was first published in 1820. It was subtitled A Romance. 

It was made into an opera entitled :
Ivanhoe: A Romantic Opera In Three Acts  
Libretto by Julian Stugis
Music by Arthur Sullivan

Aside from being adapted into an opera, the novel had an adaptation for movie and tv production.