Grey stallion imported in 1870. Apparently purchased in Istanbul from a unknown Consul there by Artur Bey Zimmerman.
The 1903 Russian Arabian Stud Book mentions Derwisz several times as an ancestor of various horses. Excerpts are below:
In the entry for Aga: “‘Dervish’ (Дервиш), Arabian stallion of Nedji, bought in Arabia from Artur-Bey in 1870.”
In the entry for Garfa: “imported Arabian stallion “Dervish” (Дервиш) bought in 1870 from Artur-Bey.”
In the entry for Mazaika+: “‘Dervish’ (Дервиш) bought in Arabia via Consul in Constantinople, Mr. Zimmerman, in 1870.”