Why do some Latin names end with both an "us" and an "i"?
- Ordericus Vitalis, or Orderici Vitalis,
- Ekkehardus Uraguensis, or Ekkehardi
Which form is correct?
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Both! The -us ending is nominative, i.e. when it's the subject of a sentence. The -i is when it's in the genitive. Think of it like English's 's.
The first book reads Historiae Ecclesiasticae Orderici Vitalis, because it means Ordericus Vitalis' (notice the genitive marker) Ecclesiastical Histories. In Latin, were I to say, "Ordericus Vitalis wrote the Historiae Ecclesiasticae," I would have written it as so: Ordericus Vitalis Historias Ecclesiasticas scripsit.
The endings change depending on how you use it. The English translation accurately reflects his name in English, so use that if you want to e.g. cite him in a bibliography somewhere or write about him in an essay.
The nominative case is the form of the noun when it acts as the subject of a sentence.
There is another case, called the genitive case, which is used to show possession.
For example, "Marcus amat puellam" = "Mark loves a girl", and "Marcus" is in the nominative case, because it is the subject of the sentence.
To say "Marcus's dog", we say "Marcī canis", where "Marcī" is in the genitive case.
The Latinized name of the historian was, in the nominative case, "Ordericus Vitalis", and in the genitive case, "Orderici Vitalis".
You can view "Orderici Vitalis" as, in English, "Orderic Vital's".