When islam arose, the were peripheral to the byzantine and sassanian empires?

maybe you need to work on the pipes in the house. i am just saying this because you did not give any details.

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".