Material for making sculpture was patinated bronze. Bronze is an alloy of copper, usually with tin as the primary alloying element, but are used and alloys with aluminum, silicon, lead, and other elements. The name "bronze" from Italian. bronzo, which, in turn, is of Persian origin "berenj," meaning "brass" or from the name of Brindisi, from which this material was delivered to Rome. Patina – a film or coating on copper and its alloys. Natural patina is the oxide – carbonate film formed on the surface of monuments or decorative products under the influence of the environment. A layer of noble patina must be protected and secure. Likeness leaves no doubt that the sculptor has immortalized in bronze of French king Heinrich IV in the early years. Who ruled from 1589 until 1610, Henry became the founder of the French Bourbon kings. This king had done a great deal for his country. Henry was married to Marguerite of Valois – sister of Charles IX, also known as "Queen Margot". Due to the lack of children, the marriage was terminated. In 1600, in exchange for a large sum, the king agreed to sign a marriage contract with Marie de Medici, the youngest daughter of the richest man in Europe – Duke of Tuscany, Francesco de Medici. In marriage with Mary the king had 6 heirs, the eldest of whom subsequently took the crown of France.