Ducis

Ducis is a Latin form that occurs in two distinct grammatical functions. It is the genitive singular of the noun dux, meaning leader or general, and it is also the second-person singular present active form of the verb ducere, meaning you lead. The intended meaning is determined by how the form functions in a sentence.

As a noun, dux is masculine and belongs to the third declension. The genitive singular ducis marks possession, as in gloria ducis (“the leader’s glory”) or dux exercitūs Romani (“the leader of the Roman army”). The title dux was used in ancient Rome and continued into medieval Latin, where it was often translated as “duke” in modern languages. Phrases such as Dux Galliae (“the Duke of Gaul”) illustrate its use as a titulature.

As a verb, ducis is the second-person singular present active indicative of ducere, meaning “you lead.” Examples include Me ducis ad portum (“You lead me to the harbour”) and Tu ducis voces in promptu et consilium in promptu (“You lead with voices and counsel,” in a stylized sense). In ordinary prose, the active form ducis appears in sentences describing someone who leads.

See also: dux, duke, ducal.