≈ Reconstructed person · research hypothesis
Isack van der Heijden
Always inspect the supporting records.
Why are these mentions grouped?
Name normalization or a strong historical spelling match and compatible chronology support this grouping. Less distinctive names require narrower time windows or recurring relationships.
Method code: fuzzy-name+adaptive-chronology-v2
Observed name forms: Isack van der Heijden · Izak van der Heijden