Tarquin
The name of two of the legendary kings of Rome. The last, Tarquin the Proud, was driven out by Junius Brutus.
legendary
How the Romans fixed the year
Censorinus, On the Birthday 20–22 (238 CE), in the edition of Friedrich Hultsch (Leipzig, 1867) · 238 CE
postea sive a Numa, ut ait Fulvius, sive, ut Iunius, a Tarquinio XII facti sunt menses et dies CCCLV, quamvis luna XII suis mensibus CCCLIIII dies videbatur explere. sed ut dies unus abundaret, aut per inprudentiam accidit, aut, quod magis credo, ea superstitione qua inpar numerus plenus et magis faustus habebatur.
Later there came to be twelve months and 355 days. Fulvius says that Numa did this, and Junius that Tarquin did. Yet the moon seemed to complete its twelve months in 354 days. The one extra day was either a mistake or, as I rather believe, came from the superstition that held an odd number to be full and luckier.
Where the months got their names
Macrobius, Saturnalia 1.12–14 (early fifth century CE), in the edition of Franz Eyssenhardt (Leipzig, 1893) · early fifth century CE; the dialogue is set in the 380s
non nulli putauerunt Iunium mensem a Iunio Bruto, qui primus Romae consul factus est, nominatum, quod hoc mense, id est Kalendis Iuniis, pulso Tarquinio sacrum Carnae deae in Caelio monte uoti reus fecerit. hanc deam uitalibus humanis praeesse credunt.
Some have thought that June was named after Junius Brutus, who became the first consul of Rome. Their reason is that on the first of June, after Tarquin had been driven out, Brutus made a sacrifice he had vowed to the goddess Carna on the Caelian Hill. People believe that this goddess watches over the vital organs of the human body.