The marquisate was bestowed by Maria Christina of Austria as Queen Regnant on behalf of her son Alfonso XIII of Spain on Manuel Críspulo González y Soto, by Royal Decree on 6 February 1902.
[1] Bonanza refers to a port of Sanlúcar de Barrameda, near the home base of the González family.
Mauricio González-Gordon y Díez obtained the title on 10 November 1980, after the death of his father, Manuel María.
[3] The heir apparent is the last holder's daughter Bibiana María González-Gordon.
The title has not been claimed since the death of Mauricio González-Gordon y Díez.