Gulielmi was born about 1689, the son of unknown parents. The place is not known.
His wife was Jona. They were married, but the date and place have not been found. Their six known children were Elizabeth (c1714-?), Ann (c1715-?), Joan (c1717-?), William (c1720-?), Margaret (c1721-?) and John (c1722-?).
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | ABT 1689 |