| Ruler | Kingdom | Era |
|---|---|---|
| Mr. Greg | 10 | |
| Mr. Greg | 24 | |
| Mr. Greg | 48 | |
| Mr. Greggy | 48 | |
| Mr. Greggy The Dread | Lietuvos Didzioji Kunigaikstyste | 48 |
| Mr. Greggy The Dread | Lietuvos Didzioji Kunigaikstyste | 48 |
| Ms. Gregjd | 48 | |
| Mr. Gregor | 48 | |
| Mr. Gregor | 48 | |
| Mr. Gregor | 48 | |
| Mr. Gregor Clegene | 48 | |
| Mr. Gregor The Ninth | The Visual Utopia Empire | 48 |
| Mr. Gregorio | 19 | |
| Mr. Gregorio Del Pilar | Mad Against Drugs | 34 |
| Mr. Gregorio Del Pilar | 35 | |
| Mr. Gregorio Del Pilar | Medieval Warriors | 47 |
| Mr. Gregorious | 48 | |
| Mr. Gregory | Katipunan | 19 |
| Mr. Gregory | 48 | |
| Mr. Gregory | 48 | |
| Mr. Gregory II | Katipunan | 19 |
| Mr. Gregoryan | 48 | |
| Mr. Old Greg | Fuzzy Little Man Peach | 34 |