of Countess
Source: Webster's dictionaryFormer kings and queens become counts and countesses (dukes and duchesses if they have reigned more than once), and former princes and princesses of Principalities become viscounts and viscountesses. Source: Internet
"I heard that Bud Fisher (creator of Mutt and Jeff ) got $3,000 a week and was constantly marrying French countesses," Capp said. Source: Internet