Proper noun
Quintilis
(historical) The month of the ancient Roman calendar which became July, the fifth month when the year began with March and the seventh after it began with January.
Livy mentions earlier consular years starting on 1 Sextilis (August), 15 May, 15 December, 1 October and 1 Quintilis (July). Source: Internet
Quintilis was renamed to honour Caesar because it was the month of his birth. Source: Internet
When Caesar decreed the reform, probably shortly after his return from the African campaign in late Quintilis (July), he added 67 more days by inserting two extraordinary intercalary months between November and December. Source: Internet