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The Duke of Amalfi is a Spanish ducal title first created in 1639 by King Philip IV for Prince Ottavio Piccolomini, a Holy Roman Imperial Army Field Marshal.
Of noble Tuscan descent, two Popes were scions of the Piccolomini family, and the 1st duke's younger brother Dom. Ascanio served as Archbishop of Siena.from 1628 until 1671.
King Alfonso XIII revived the dukedom in 1902.
Succession
As with other Spanish noble titles, the dukedom of Amalfi descended according to cognatic primogeniture, meaning that females could inherit the title if they had no brothers (or if their brothers had no issue). That changed in 2006, since when the eldest child (regardless of gender) can automatically succeed to noble family titles.
References
Dukedom of Amalfi Wikipedia(Text) CC BY-SA