Learn Latin from the Romans A Complete Introductory Course Using Textbooks from the Roman Empire

In addition to the six regular cases, Latin has a locative case. The locative is used instead of in + ablative to express location (i.e. the place where someone or something is, when no motion to or from is involved), but only with certain words, including domus and the names of cities and towns. Because the locative has no endings that are uniquely its own, and because most words do not have a locative case, the locative is not traditionally learned as part of noun paradigms. Nevertheless, it is necessary to know how to recognize and to form locatives for those words that have them. The rule of formation is that for words of the first and second declensions the locative is the same as the genitive in the singular and the same as the ablative in the plural; for words of other declensions the locative is always the same as the ablative.