The House of Arenberg is an aristocratic lineage that is constituted by three successive families who took their name from Arenberg, a small territory of the Holy Roman Empire in the Eifel region. The inheritance of the House of Croÿ-Aarschot made the Arenbergs the wealthiest and most influential noble family of the Habsburg Netherlands. The Arenbergs were mediatized in 1811. The current head of the house bears the title of Duke of Arenberg, while all other members are princes or princesses. They all enjoy the style of Serene Highness.