Wilhelm was born before 1270, the son of Ulrich I von Neuenburg and Agnès de Montbéliard. The place is not known.
He died on 19 MAY 1324. The place is not known.
His wife was NN von Wädiswil. They were married, but the date and place have not been found. Their only known child was Agnes (?-?).
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Wilhelm I von Aarberg |
Ulrich I von Neuenburg |
Ulrich III von Neuenburg |
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Jolanthe von Urach |
Egino IV von Urach |
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Agnes von Zähringen |
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Agnès de Montbéliard |
Thierry III de Montfaucon |
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Algearde von Pfirt |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | BEF 1270 |
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| Death | 19 MAY 1324 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | graf und herr von Aarberg |