While we're at it here's the current Aztec emperor

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The Duke of Moctezuma de Tultengo is a hereditary title of Spanish nobility held by a line of descendants of Moctezuma II, the ninth Tlatoani of Tenochtitlan. Since 1766, the title has been attached to a Grandeza de España, or a place in the Spanish peerage — the highest honor accorded to Spanish nobility.

The original title of Count of Moctezuma, from which it descends, was given by Felipe IV of Spain in 1627 to Pedro Tesifón Moctezuma de la Cueva, 1st Viscount of Ilucán, Lord of Tula and Peza, a Knight of Santiago and a great-grandson of Moctezuma II through his son Pedro de Moctezuma Tlacahuepan.

Carlos II of Spain later granted the second holder of this title the qualification of de Tultengo, in reference to a town in the Mexican state of Hidalgo which was part of the inheritance of Moctezuma’s son Pedro. All subsequent holders from 1635-1865 used the title, “Count of Moctezuma de Tultengo” until the advancement to the rank of duke removed de Tultengo.

The current holder of the title is Juan José Marcilla de Teruel-Moctezuma y Valcárcel, 6th Duke of Moctezuma de Tultengo. His father had assumed the title and was regranted the qualification of de Tultengo (as the second Count of Moctezuma was in 1639) by Juan Carlos I of Spain in 1992.

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