Bonheur had a close working relationship with his brother-in-law, the celebrated Parisian founder Hippolyte Peyrol who was married to his sister Juliette. These close ties resulted in the production of exceptionally cast and finely chased bronzes, often identified by Peyrol's miniscule cachet. Edited by Peyrol, the detailing of the present casts is very fine, suggesting a close understanding between founder and sculptor.
The models of the two bulls were first exhibited in plaster at the Paris Salon of 1865 exhibit number 2877 and 2878 and were cast in an edition of three sizes by Hippolyte Peyrol. The original lifesize casts were commissioned by the Sultan of Constantinople, Sultan Abdul Aziz, for the gardens of the Palais de Belerbey.