In Scotland, sometime in the mid to late 1700's, James Abernethy 3rd of Mayen married Jane Duff. At an elecion dinner in Aberdeen, James got into a quarrel with John Leith of Leith Hall and shot him dead outside in the street. James made his escape but was outlawed and died abroad.
The Earl of Fife secured the property and income of Mayen for Jane Duff and her children. The son and heir, James, died sans progeny in 1785, age unknown, at which time the husband of one of his sisters bought out the other two sister's interest and became Duff of Mayen.
Can anybody identify this Earl of Fife, and suggest how he is related to Jane Duff?
Can anyone provide any data for James Abernethy, 3rd of Mayen?