Career
After a stint in the diplomatic service of the Second Empire from 1867 until 1870, he saw service during the siege of Paris in the Franco-Prussian War. He then returned to the diplomatic service, occupying posts in Germany, Serbia, Russia, and Switzerland. Kerjégu stood in the election of 1889 as a republican candidate, winning election with some 94% of the votes cast in his constituency in the Finistère.
A committed republican, he was dedicated to law and order and governmental stability.
He concerned himself particularly with economic and agricultural issues, and supported progressive causes, including welfare and public disability insurance. On the other hand, he opposed the progressive income tax and the separation of church and state, and he favoured a strong military.
He died in Paris during his fifth term in the Chamber. Kerjégu"s Christian name was in fact the English form James, rather than the more common French form Jacques.