The Canons of the Council in Trullo; Often Called The Quinisext Council 48Canon XLVIII.

The wife of him who is advanced to the Episcopal dignity, shall be separated from her husband by their mutual consent, and after his ordination and consecration to the episcopate she shall enter a monastery situated at a distance from the abode of the bishop, and there let her enjoy the bishop's provision. And if she is deemed worthy she may be advanced to the dignity of a deaconess.