1.1.35 “his moorships ancient”

Othello is referred to, by Roderigo and Iago as "the moor" or derivatives of that.  Iago refers to him here, very near the beginning of the play as "his moorship," which can be interpreted to be condescending or a rhetorical device on Shakespeare's part to further set Othello apart.  For a character like Iago who's motivations are obscure, his condescension of Othello fits him, but also seems inexplicable.  His own character and ease of switching between multiple personae seems to fit his treatment of Othello.  He forces a disguise upon Othello and thus forces a particular lens through which others view him.