The earldom, and the viscounty of the United Kingdom, being limited to heirs male, became extinct, but the barony, being to heirs general, passed to his daughter, Sophia Charlotte (1762-1835), who married the Hon.
As Gaston left only daughters, the viscounty passed at his death to the family of Foix, from whom it was transmitted through the houses of Grailly and Albret to the Bourbons, and they, in the person of Henry IV., king of Navarre, made it an apanage of the crown of France.
When Gaston-Phoebus wished to establish a regular annual hearth-tax (fouage) in the viscounty, he convoked the deputies of the three estates in assemblies called accts.
Argentan was a viscounty from the 11th century onwards; it was often taken and pillaged.
Avallon (Aballo) was in the middle ages the seat of a viscounty dependent on the duchy of Burgundy, and on the death of Charles the Bold passed under the royal authority.
Sackville, in characteristic fashion, stipulated for a viscounty, as otherwise he would be junior to his secretary, his lawyer and to Amherst, who had been page to his father.
The principal places of interest on the banks of the Earn are Dunira, the favourite seat of Henry Dundas, ist Viscount Melville, who took the title of his barony from the estate and to whose memory .an obelisk was raised on the adjoining hill of Dunmore; the village of Comrie; the town of Crieff; the ruined castle of Innerpeffray, founded in 1610 by the ist Lord Maderty, close to which is the library founded in 1691 by the 3rd Lord Maderty, containing some rare black-letter books and the Bible that belonged to the marquess of Montrose; Gascon Hall, now in ruins, but with traditions reaching back to the days of Wallace; Dupplin Castle, a fine Tudor mansion, seat of the earl of Kinnoull, who derives from it the title of his viscounty; Aberdalgie, Forgandenny and Bridge of Earn, a health resort situated amidst picturesque surroundings.
Albi (Albiga) was, in the Gallo-Roman period, capital of the Albigenses, and later of the viscounty of Albigeois, which was a fief of the counts of Toulouse.
From the 10th to the 13th century Aubusson was the centre of a viscounty, and the viscountess Marguerite, wife of Rainaud VI., was sung by many a troubadour.
Thus the viscounty became extinct on his death, but the English and Irish baronies descended to his elder daughter Margaret (1788-1867), who married the Comte de Flahault de la Billarderie, only to become extinct on her death.