| after the death of charles | 5 | temporal |
| in the north | 4 | location |
| by the vikings | 2 | other |
| empire → be → attacked | 5 |
| empire → be under → attack | 3 |
| negative | neutral | positive |
| 0.632 | 0.355 | 0.013 |
| Raw frequency | 8 |
| Normalized frequency | 0.279 |
| Modifier score | 0.600 |
| Perplexity | 97.010 |