The sixth month (beginning from March) was once called
sextilis, but was changed to Augustus in compliment to Augustus
Cæsar of Rome, whose “lucky month” it was, in which occurred many of
his most fortunate events.
The preceding month (July), originally called Quintilis , had
already been changed to Julius in honour of Julius Cæsar.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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