fiebant

fiebant is a Latin form of fio, meaning “become, be made; happen”. It is the 3rd person plural active indicative.

Found 40 times in the Latin texts on Socratos.

Where it is used

Caesar, De Bello Gallico 8.13.1: Non intermittunt interim cotidiana proelia in conspectu utrorumque castrorum, quae ad vada transitusque fiebant paludis.

Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.