After the death of Julius Caesar in 44 BCE, Mark Antony came up with the idea of honoring deceased ruler and name the seventh month with his name. This is how Latin Julius, French Juillet and English July were created, which is simply July (in our name comes from summer blooming July).
In 8 BC. The Roman Senate decided to name the next month the name of Emperor Octavian Augustus (August, French – Aout).
And because the Senate recognized Augustus as equal to Caesar, so that he would not be harmed – one day was added to “his” month, so that there would be also 31. To maintain order, February was shortened by one day and there were 28 left.
Caesar sought to overtly idolize him during his lifetime, which was soon after his death, when a comet appeared in the sky recognized by the superstitious Roman plebs as Caesar’s soul. Deification was approved by the Senate (January 1, 42 BCE), who recognized Caesar’s transition from the human world to the world of gods, calling him “divine Julius” (title Divus Iulius or Divus Julius). Already after his death on August 18, 29 BCE the Temple of the Divine Caesar (Templum Divi Iulii) was dedicated to the Forum ROmanum.