Was Ivan well-liked or at least tolerable in the 1540s and 1550s, prior to his institution of the oprichnina? Does the oprichnina mark the period in which Ivan’s mental health deteriorated or was he extremely paranoid throughout his entire rule? What exactly was the oprichnina? I know it was a second, separate administration instituted by Ivan but what was its intended goal? Did the oprichnina have any other function besides its infliction of a reign of terror?