CREATE TABLE table_20891 ("Archbishop" TEXT, "Born" TEXT, "Ordained Priest" TEXT, "Ordained Bishop" TEXT, "Appointed Archbishop" TEXT, "Vacated throne" TEXT, "Died" TEXT)

What date was the person ordained as a priest in December 1838 ordained as a bishop?
SELECT "Ordained Bishop" FROM table_20891 WHERE "Ordained Priest" = 'December 1838'
SELECT "Ordained Bishop" FROM "table_20891" WHERE "Ordained Priest" = 'December 1838'