Short answers, pulled from the story.
The Senate used Latin to record the recognition of Vespasian as emperor on a bronze tablet from 69 AD. This document illustrates how Latin served as the primary language of imperial administration and legislation throughout the classical period.
Emperor Septimius Severus spoke Punic along with Latin and Greek. He was born in Leptis Magna where Punic continued to be used during the Imperial period alongside Latin and Greek.
Coptic became the standard language for Christian liturgical texts from the 4th to 7th centuries. By the 640s, Coptic-speaking Christians constituted the majority of Egypt's population under Arab rule.
More than one billion people spoke first or second languages derived from Latin by the early 21st century. These include Spanish Portuguese French Italian Catalan Occitan Aromanian Romanian Sardinian Dalmatian Venetian and African Romance.
The inscription combines Latin and Palmyrene Aramaic suggesting Barates was bilingual in Aramaic and Greek while adding Latin as a third language. Regina herself is identified as from the British Catuvellauni people whose capital was Verulamium.