Heat oven 375 F.
Place oranges in cavity.
Combine grated orange peel with chopped sage leaves, butter (kind of softened), salt and pepper. Rub mixture under chicken skin all over; reserved some for the outer skin.
Place chicken into roasting pan, tie legs with twine. Rub remaining butter mixture all over outer skin.
Roast chicken for 2 hours; 15 minutes before 2 hours, take out chicken, brush with marmalade all over.
If you have rack set for the roasting pan, it would be a great use instead placing the chicken right into the roasting pan because once chicken is done, it would most likely stick to the pan.
Occasionally, brush chicken with melted fat inside the pan for greater flavor.