Jacob lived at Silver Spring in County Wexford.
In 1827, he was reported as having fought a duel with Lieutenant Goodwin, the pair firing two shots each before they were arrested and bound over to keep the peace.
[1] Jacob stood in the February 1834 Dungarvan by-election as a Radical, with the support of Daniel O'Connell.
The May 1834 Dungarvan by-election was held, which Jacob again won, this time taking the seat in Parliament.
[3] From 1838, Jacob lived in London, and when arrested over a debt in 1839, he declared that he no longer owned any property in Ireland.