The Duke of Arcos is a noble title in the Spanish nobility, historically associated with the region of Arcos de la Frontera in Andalusia. The title was first granted in the 16th century and has been held by various noble families over the years. The dukedom is part of the larger hierarchy of Spanish aristocracy, which includes titles such as marquess and count. The current holder of the title is a member of the House of Medinaceli, one of the most prominent noble families in Spain. The Duke of Arcos has traditionally held significant social and political influence, often participating in royal ceremonies and events. The title reflects the rich history and cultural heritage of the Spanish nobility.