James was undoubtedly a member of the Bosawsack family whose name originally refers to a place in the parish of Constantine. 1 In the Protestation Return of St. Gluvias Penryn are listed Richard Bossausack Sen. and Thomas Bossawsack who, according to the Visitation, were brothers. They had another brother James (aged 21 years in 1620) who died in 1627. These brothers would have been of the generation preceding James. Richard Bosawsack Sr. died in 1643; his brother Thomas had sons Philip and John born in Penryn in 1647 and 1650 respectively. Thomas died in 1654.
At the time of the Hearth Tax in 1664, James Bossowsack was assessed of 5 hearths. James Bosawsack married Jone Badcock in St. Gluvias on 17 Oct 1657. They had a daughter Mary who was born and died in 1658. James Bosawsack was buried in St. Gluvias on 21 Jan 1676/7. It is possible he was the father of James who married Jane King, although a baptism entry for him in the St. Gluvias parish register has yet to be found.
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James Besoesacke was named in the Will of his father-in-law Reginald Kinge of Gwinear as the husband of Reginald's daughter Jane.