Sui generis
In local government, a "sui generis" entity is one that does not fit with the general scheme of local governance of a country. For example in England, the City of London and the Isles of Scilly are the two "sui generis" localities, as their forms of local government are both (for historical or geographical reasons) very different from those of elsewhere in the country. 
In a press conference during which reporters were trying to analyse his political personality, Huey Long said, "...say that I am "sui generus", and let it go at that."
Pater familias
Women emancipated from the "potestas" of a "pater familias" were independent by law ("sui iuris") but had a male guardian appointed to them. A woman "sui iuris" had the right to take legal action on her own behalf but not to administer legal matters for others.