Comes Glusiano de Casate (Latin: Comes Glusianus de Casate; Italian: Cosmo or Cosimo Giussiano; born in Milan, date unknown; died in Rome, 8 April 1287) was an Italian ecclesiastical lawyer and Roman Catholic Cardinal. He came from an important family, de magno sanguine natus (born from high blood), as his funeral monument states. He was learned in the law, "tu sapiens pectus iuris vexilla ferebas."[1]
He was Archdeacon of the Church of Milan.[2]