| Sg | Pl | |
| Nom | konungastefna | konungastefnur (rule) |
| Acc | konungastefnu (rule) | konungastefnur (rule) |
| Dat | konungastefnu (rule) | konungastefnum (rule) |
| Gen | konungastefnu (rule) | konungastefnna (rule) |
| Sg | Pl | |
| Nom | konungastefnan (rule) | konungastefnurnar (rule) |
| Acc | konungastefnuna (rule) | konungastefnurnar (rule) |
| Dat | konungastefnunni (rule) | konungastefnunum (rule) |
| Gen | konungastefnunnar (rule) | konungastefnnanna (rule) |