He was born on 12 June 1844. He was the father of
Aage Berntsen and
Oluf Berntsen. Very early he took part in politics as a quick-witted and popular agitator but belonging to the
Moderate Venstre he was for many years without much political influence. After the beginning reunion of the old Venstre groups he played a greater role as a minister that led to the forming of his own cabinet. He was a personal friend of King
Frederik VIII and enjoyed the king's support but his government was accused of lacking social understanding. 1913 he proposed the revision of the Constitution that was carried through by the second
Zahle Cabinet. When he retired from politics in 1926 he was one of the oldest Danish active parliamentarian politicians ever. As a member of the Folketing 1873-1884 and again 1886-1926 he remains the longest-serving member of the Danish Parliament and the only member for over 50 years. He died on 27 March 1927. ==References==