Y gwahaniaeth rhwng diwygiadau o "Sir Forgannwg (etholaeth seneddol)"

|rowspan="4"| [[Christopher Rice Mansel Talbot]]
|rowspan="4"| [[Y Blaid Ryddfrydol (DU)|Rhyddfrydol]]
|style="background-color: {{Liberal Party (UK)/meta/color}}" |
| [[Lewis Weston Dillwyn]]
| [[Y Blaid Ryddfrydol (DU)|Rhyddfrydol]]
| <!-- party -->
|-
| 1837