Heir Designate is an Heir that was promoted to that status as opposed to having been popped as an Heir.Erf-b1-p079, Erf-b1-p082
Promotion to Heir Designate rarely occurs and is very expensive.Erf-b1-p079
Known Heir Designates
Caesar Borgata was a low-rank Noble which was promoted to Heir Designate after Don King's unfortunate shots at heir-popping.
The only known non-Royal Unit promoted to Heir is Stanley.