The word 'joro' refers to court ladies in Joganden (Imperial Residence for Sewing), Naishi no Tsukasa (female secretaries to an emperor), or Naishi no suke (court ladies of higher ranks) of the Second or Third Rank, in other words, the daughters or granddaughters of daijin (councils of the Imperial Court) who were allowed to put on the colors of the Imperial families.
上臈とは貞観殿、内侍司、および二位、三位の典侍で禁色をゆるされた大臣の女、あるいは孫女などのこと。