Gabriel Ponce de León y Lencastre, 7.º Duque de Aveiro - No wife, no children

https://en.wikipedia.org/wiki/Gabriel_of_Lencastre,_7th_Duke_of_Aveiro

Only after his mother's death (1715), he came to Portugal. While he lived in Spain, King Charles II granted him the title of Duke of Baños, and he served in the Spanish army, both in the Catalonia and in the Flanders campaigns.

He died single without issue.

After his death the Duchy was claimed by his nephew, António de Lencastre Ponce de León (son of Joaquin 7th Duke of Los Arcos), and by José de Mascarenhas, 8th Count of Santa Cruz and 5th Marquis of Gouveia (descending from Álvaro and Juliana of Lencastre through female line).

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Disconnected “family”

Ms Enriquez Revira de Mendoza Was not a known wife.

G8 Inés Marcelina Ponce de León Enríquez de Ribera & Ponce de Leon - Aguilar were not known children.