John William Thomson/William John Thomson was born in Dumbarton Scotland in the year of 1375. He owned land in Dumbarton and was the Collector of Customs in 1410 as per his accounts rendered at Perth, on July in the year 1410. William's wife is unknown at this time. He left his land to Johannes Van Kirk Thomson, (his son) who was born in Dumbarton Scotland in the year of 1400. In 1429 Johannes became a Bailiff and was so until 1431. After serving as Bailiff he became Commissioner in 1435. Johannes or John as per the records show owned land in Ayrshire as the deed showed in 1456. Then he became the Sergeant of the Marsh in 1468. The Thomson Clan as for as I can tell fell after the death of Johannes on 18 Oct 1486 in Newton Grange, Scotland. The Clan was strong and more powerful in numbers than Clan MacTavish at this time, but had strong ties with Clan Campbell. Johannes's wife was Christina who was born in 1449 in the Highlands of Scotland, and died in Newton Grange, Scotland date is unknown.