From Wikipedia:

At the point where the bridge crosses the Île de la Cité, there stands a bronze equestrian statue of king Henry IV, originally commissioned from Giambologna under the orders of Marie de Médicis, Henri’s widow and Regent of France, in 1614. After his death, Giambologna's assistant Pietro Tacca completed the statue, which was erected on its pedestal by Pietro Francavilla, in 1618. It was destroyed in 1792 during the French Revolution, but was rebuilt in 1818, following the restoration of the Bourbon monarchy. Bronze for the new statue was obtained with the bronze from a statue of Louis Charles Antoine Desaix, as well as from the statue of Napoleon in Place Vendôme, which was melted down. The new statue was cast from a mold made using a surviving cast of the original. Inside the statue, the new sculptor François-Frédéric Lemot put four boxes, containing a history of the life of Henry IV, a 17th-century parchment certifying the original statue, a document describing how the new statue was commissioned, and a list of people who contributed to a public subscription.