Excerpts from Books and Wikipedia
"When the last Carolingian king, Louis V, died in May 987 without an heir, Archbishop Adalberon of Rheims had little difficulty in persuading the nobles to elect Hugh as king. . . . The practice of crowning the heir during the king's lifetime continued and was a powerful contributory factor to the longevity of the Capetian dynasty, a line of fourteen kings who ruled France until 1328." [Furtado: 1001 Days]